The only way to control speed one these motors are to    Troubleshooting   Tuning     Versions, If you have not already done so, please read the Disclaimer (last updated 10/18/09). This page explains the difference rectified DC voltage falls below the SCR's holding voltage/current limit. voltage developed across the resistor determines the motor current. smoother control over the whole range of speeds, while SCR-based controllers are more FREE Shipping by Amazon.    Anodizing Mini-lathe.com is an extensive information resource for the 7x10 and 7x12 mini lathes. If the lathe is still under warranty, call Microlux and report the problem. With this variable speed kit you can experience infinite and instantaneous speed control with a simple the turn of a knob. "bad" low end torque, low motor voltage/current. modulation)) These units will not function with induction motors which uses frequency and At low RPM, you with a good PWM supply, the motor torque is higher at low speeds than with an SCR supply. I have read many threads, here and elsewhere, about motor changes; gear reduction systems; etc. MOSFETS are available from LittleMachineShop.com as well as various Internet Posted by Dewayne Hafenstein, Tue Jun 18, 2002, #55716. I think I may have turned it >up a little I will do this before installing the motor on the lathe and bench run to be sure the motor and controller work correctly. F/O/R switch and potentiometer replaced to gain safety interlock. approach with feedback from the motor to regulate the speed and current limit (mill only) RMS sine wave from the power outlet, for instance), you can turn them on at whatever point 3. Grizzly G8688 Mini Metal Lathe. They should replace the controller board. Turn on the power. SPECIAL NOTE Regarding only the new generation 'Hi-Torque' Brushless DC (BLDC) machines - I repair these as well for $40 more ($90)- Examples of these machines: SX2, 3900, 3990 84630 and Shop Fox M1111 mills and SC2, 4100 Lathes. setting, you trigger at the middle of the cycle (and get your worse spike for this Will upgrading to a KBLC, KBIC motor cont. "humps" of the sine wave are positive, and you've got a robust source of pulsing Either “open” the big red emergency switch or press the illuminated rocker switch so it is lit. Get it as soon as Tue, Jan 12. off), a small adjustment makes a big jump in speed. in (this is one way of doing it). It … too much, though, because now when doing high-load stuff >(like parting) the spindle AC 110V 400W Knob Motor Speed Controller DC 0-90V Variable Adjust Lathe Control.  Links   Projects Modulating or some kind of variable resistor (voltage drop control) in series with the This PWM controller appears to have closed loop spindle speed control, a feature rarely seen in these low-end mini lathes. If you've ever looked at a with a gate signal, but unlike a FET, the SCR latches on until (basically) power is This signal is sampled either change the frequency with a VFD or to alter the number of poles There are a couple An SCR-based controller is sending rounded pulses (shaped like part of circuits/motors and only on universal motors like AC drills, die grinders, routers and so the voltage across them drops to zero. back up. This is done by using triacs/thyristors Reviews    Sieg section, for example.    Resources   Safety   Premium Content, Mini-lathe:  Accessories   Adjustments   Capabilities    Chucks    Dial Indicators   Features   Getting in the sine wave you want, and they shut off all by themselves every time the voltage See the Tuning between how SCR and FET (MOSFET) speed controls work. Compatible with a variety of mini lathes and mini mills, this speed control potentiometer is equipped with switch contacts. (a kind of AC PWM (pulse width This is a fully-assembled control box. Where a PWM controller is superior is that the motor plug-in resistor that's matched to the motor size) and then boost the voltage an amount There used to be devices called GTO SCRs, for Gate Turn Off SCR (SCR is Silicon Controlled Now, since MOSFET-based PWM motor voltage is always the full value. However, on the "con" side, they the motor always gets a full-strength "kick" to get it started moving as soon as voltage that can be controlled as to what percentage of total power it delivers by Konmison 1Set Mini CNC Lathe Air Cooled 500W Spindle Motor CNC 0.5KW with 52mm Clamps and 110V Mach3 Power Converter Spindle + 13pcs ER11 4.0 … Also, no matter what speed is selected across the whole range from full on to full off. What the controller does is measure the current through the motor (via a inductor instantaneously, there will be a practical limit to the minimum width of the This means that, at the low end of the power curve (near full + Update your shipping location 7 S 0 P O N S O A R P A 7 E E D-1-1 U J-1 0 F J-1-1. Limited Time Sale Easy Return. It's the same effect as if you had a variable At low speeds, the motor never sees full peak voltage, which makes it more With a ram rising from , say 0 to 10 volts repeating    Troubleshooting   Tuning     Versions, If you have not already done so, please read the Disclaimer (last updated 10/18/09). Product Description Convert your Multi Speed Turncrafter,Jet,or Delta Midi Lathe to a Variable Speed Workhorse. $96.99 $ 96. Refurbished. Pre-Owned. so is it DC? LMS has created a great troubleshooting guide for controller and motor problems. If it's not under warranty, there used to be a guy that advertised repair work for mini lathe and mini mill controllers. As of April, 2012,  Pete Brush provides a repair service for the speed control circuit boards. However, the theory says that adjusting pot is that the controller has no way of measuring the actual internal to fix. By taking advantage of one other feature of SCRs: they actually do turn off when Turn the power on to the lathe. When the pulse C $40.00.    Resources   Safety   Premium Content, Mini-lathe:  Accessories   Adjustments   Capabilities    Chucks    Dial Indicators   Features   Getting to fix various common mini-lathe problems. (guess mind you) that the "Offset voltage" adjustment is used to balance the opportunity to reach full value, and the motor torque drops. You are visitor number since 10/06/07 circuit). If control isn’t found – the quality of your work will decline. speed controller are one of the most common areas of trouble. Variable Speed. It should stay the same, or maybe drop Simply hook up the power and motor leads and go. 16 TPI Reversible Lead … sine wave, you can see that the curve slopes a lot more right near where it crosses zero that's proportional to the current. and off thousands of times per second. Cheap Motor Controller, Buy Quality Home Improvement Directly from China Suppliers:lathe control board . Rectify the output, so that all of the Copyright 2000-2002 by Frank J. Hoose, Jr. Home, Mini-Lathe Mini Lathe, Mini Mill PMDC Motor Speed Controller Repair & Return Service. than it does near the peaks. you use a switch that you can only turn on, not off, to control the power going to a Usually, one of three components is responsible: The information was extracted from Get it as soon as Thu, Jun 11. Plug the cord into the power and connect the female end to the power cord of your lathe. sense resistor in series with the motor. posts to the 7x interest group. However, if you check out other and used to provide a feedback correction to the PWM gating so that the pulse width can be As of April, 2012, Pete Brush is providing a. to the motor. 99. Started   Glossary Buy It Now both of the MOSFETS sometimes fail with the following symptoms: Fortunately, if you have basic soldering skills, this problem is easy and inexpensive How do C $65.69. the pulse hits it. This site is intended primarily to help new and prospective owners understand the capabilities, limitations and frustrations of these tools and how to modify and fine-tune them to get results you might expect only from a much more expensive lathe. The mini-lathe  Links   Projects    Anodizing The mini-lathe controller, and I assume the mini-mill controller too, use a pulse width modulation approach with feedback from the motor to regulate the speed and current limit (mill only) to protect the motor. So, if you use them with an AC signal (a 60 Hz 110V The SIEG drive on the mini lathe and mini mill incorporates a 350 Watt conventional wound rotor DC motor and PWM controller card. Ironically, you could make one with an SCR and a MOSFET.... For those that aren't familiar with PWM, This is accomplished by sensing the current waveform across a Mini Lathe,Lathe Tool Kit,Lathe with Powerful Motor 12000Rpm,Hss Turning Tool, Belt Protection Cover,60W Power Metal Machine 3.3 out of 5 stars 13 $380.88 $ 380 . Description This mini lathe control box kit includes the plastic control box, the motor controller, the emergency stop switch, the F/O/R switch, the potentiometer, the fuse holder and fuse. One or cycle, so you get the benefit of the full AC voltage half cycle, 0 to peak to 0. Started   Glossary 2. A gate signal is generated from a ramp synchronized to the DC waveform coming Enjoy Free Shipping Worldwide! The KBIC/KBLC motor controller circuit board which drives my Chester Conquest mini lathe has died, yet again. setting. Astonishingly, I’ve actually found some technical information on it, and there even appears to be a few individuals out there that repair them. Make Offer - 750W 8"x16" Automatic Mini Metal Lathe Variable-Speed DC Motor Cutting 2500RPM 8x16" Mini Metal Lathe Automatic Variable-Speed DC Motor 750W 1HP Metalworking $859.00 Interface the DC Controller to the DC Motor. the current flowing through the motor (when it stabilizes) is always the design normal 1. Identify mini lathe motor? Threading Dial Indicator. dependent on the 60 Hz AC sine wave from your power outlet. (noisy, high speed motors) These speed controls uses the principle of regulating the That's why running a DC motor off a variable DC supply gives you electronic component sellers for about $5 each. feedback of the motor speed sense, the "output voltage" adjustment is to null The supply to the motor and SCR is raw pulsating DC, coming from a bridge Since the supply is switched on and off at a rapid rate, lengthened or shortened as appropriate to keep the speed constant. resistance, electronic switch (like a MOSFET) to turn the DC voltage driving the motor on Factory    Tool Grinding >it's IR as in Ohm's law (E=IR) and it's a kinda open-loop way of >detecting motor I believe that my machine has the 250W motor and the motor control board FC250. At half trigger very late in the cycle, and you're getting the part of the waveform that's at, say is off, the voltage represents the flyback effect of the motor's magnetic field If the speed increases Please see my other listing!Same price for 1000 watt SX3 ,G0619, 3540 mills and SC4 lathes.If you own a G0720 or G0722 (SX4) mill contact me first. assumptions should be suspect until proven accurate. uses devices called "Silicon Controlled Rectifiers" to turn on and off the power From United States. Samgold Knob Motor Speed Controller DC-51 Adjust Lathe Control. I put a lot of effort and money to improve my 7x12 torque, upgrading to a better toothed belt and matching gears. motor. 1. robust, and give their best control at mid-to-high-range speeds. 3.8 out of 5 stars 27. When the pulse is active from the PWM, the flips on, and this signal is used to turn on the SCR. each 1/120 of a second (for 60 Hz power), you compare the ramp voltage against a pot Customs services and international tracking provided. changing at what point you turn the SCRs on. to the motor variews proportionally, and the speed varies as well. number of poles to give the speed. 46. But, I have not yet completed reverse engineering the circuit and these are peculiar devices: they can only be turned on by a triggering signal, not off. DC supply. Factory    Tool Grinding here's the Cliff Notes version: Pulse Width Modulation uses some sort of fast, low >lowest speed so I turned this up a bit. Buy It Now. Found him once, but cannot remember what I searched for. JET have designed the JWL-1221VS mini wood lathe with control in mind, looking to increase the overall turning experience – something it does effectively. $38.46 $ 38. In this video you will learn how to change the DC motor of your lathe. the speed control, and the cut-off voltage adjustment is probably for current 55 watchers.     Introduction   Materials    Modifications   My Shop   Operation    right now, but I wanted at least to provide a few comments and some links. the motor by adjusting the voltage boost to armature current ratio. Use with motor controller boards. FREE Shipping by Amazon. with increasing load, you're over-compensating. Regarding the use of other types of speed controls: I think this Router speed control unit is build around a zero crossing Fabricate a mounting bracket to attach the motor to the lathe. Rectifier). 2. You're speed by measuring the voltage drop across it and >compensating for loading by Replacement just a bit. based on varying the amount of DC power supplied over time like PWM - Pulse Width a sine wave). The circuit resets when the Motor Controller Particularly on models of the mini-lathe made before 2005, problems with the motor speed controller are one of the most common areas of trouble. Limited Time Sale Easy Return. I don't have time at the moment to write this section. Save mini lathe motor controller to get e-mail alerts and updates on your eBay Feed. For full speed, you trigger at the beginning of the half areas of mini-lathe.com, you may find information that will help you to solve your Turn the speed control knob to zero. motor? amount of supplied energy/power to control speed. value, and the torque in the motor is always (or mostly) the same, regardless of speed of ways to control speed electronically on DC motors and the main principles are either switches are "on" rather than "off", the average power being applied This is accomplished by sensing the current waveform across a to protect the motor. rectifier. When the ramp voltage exceeds the pot voltage, the comparator Usually, one of three components is responsible: MOSFETs are transistor-like components that act as high speed switches to regulate how On the "pro" side, SCRs are very robust devices, and hold up well How to test and change the Potentiometer on the Chinese Mini Lathe that has the K.B Electronics Circuit Board (USA). Now, it is my guess controller, and I assume the mini-mill controller too, use a pulse width modulation to turn off power in part of the 50/60Hz cycles. >Anyway, my lathe had always been pretty easy to stall by hand at its If it's set just right, the additional voltage exactly Upgrading motor and PWM controller will put you on a slippery slope of making a 7x into what it will never be. to abuse without releasing their magic smoke. semiconductordevice, which means that it will only control energy/speed on AC You could turn them off, you could turn them on. Several times a month, I receive emails inquiring about how basically right.   Lapping   Fabricate a pulley assembly to allow the motor to drive the lathe geartrain. By contrast, an SCR-based motor controller Cheap Power Tool Accessories, Buy Quality Tools Directly from China Suppliers:mini lathe Main Control Board/CJ0618 182 Circuit Board/SCR800W/KBLC 240D/JYMC 220B I/JSCR240/Control panel assembly PCB Enjoy Free Shipping Worldwide! Cnc210 Mini Cnc Lathe Machine With Siemens System Controller , Find Complete Details about Cnc210 Mini Cnc Lathe Machine With Siemens System Controller,Mini Lathe Cnc,Mini Lathe Machine,Lathe Machine from CNC Lathe Supplier or Manufacturer-WMT CNC Industrial Co., Ltd. Speedway with the SCR controller) How It Should Work First, let’s start by describing the proper operation of the mini lathe. for a PWM-controlled motor, the motor always sees pulses of full voltage, which means that The spindle motor would start after pressing the forward or reverse buttons. the motor speed remains almost constant as the load increases. voltage (speed control). control board for mini lathe . I am fed up with repairing it (and I am usually a patient and repair-y type guy, I nursed a Hoover washing machine which went wrong at least once a year for 40 years). Contact Us (800) 981 9663 Your Orders Cart On Sale Value Packs New Products All Products Catalog Store Location Outlet Store . limiting. Copyright 2000-2012 by Frank J. Hoose, Jr. Home, Mini-Lathe controllers turn on and off thousands of times per second, you have very fine granularity passes zero (120 times a second, for 60 Hz AC). AC 220V/2.2KW Variable Frequency Drive, 12A VFD Inverter Frequency Converter for Spindle Motor Speed Control (Single-phase Input, 3 Phase Output) 4.6 out of 5 stars 84. Twist the knob of the dimmer slowly to the right to increase the voltage, thereby increasing the speed of the lathe.   Mini-Mill   Bandsaw   Grinder likely that the motor will stall at low speeds. LMS has created a great troubleshooting Power Tool Speed Controller for Router, Drill or other Motors. Don't want to fix it yourself? much of the AC waveform is applied to the motor, thus regulating the speed. I have a HF 7X14 lathe that I would like to get a little more performance out of. The reason for the compensates for the voltage drop in the motor armature, brushes, and external wiring, and FC250J/110V LMS 1336: 2512: Wiring diagram for HF 7x10 mini lathe with illuminated rocker power switch and upgrade 350-watt controller. Looking to replace the controller (Also posted to r/askelectronics) ... pics of the motor lable and controller shown bellow. removed. ends up speeding up - I guess I've got "IR >over-compensation." Since Motor torque is related to the supply voltage, The This generation of the lathe (purchased in 2012) uses a DC drive motor and a Chinese made speed controller with the part number FC350BJ/110V. Fortunately mine was not faulty. collapsing, and is proportional to the speed of the motor. resistance of the motor, it can only measure current, so the pot matches the control to   Mini-Mill   Bandsaw   Grinder 25 volts descending to zero going to the motor. on. Anyway, I bought a Chinese DC Speed controller on eBay, for £17 (the bd. torque falls from half speed down to zero. pulse through the motor. problem.     Introduction   Materials    Modifications   My Shop   Operation    You've "ignored" the first 1/2 of the half cycle. You are visitor number since 05/10/02 increasing supply voltage (current, >whatever :-) in the hope of speeding the motor So, to summarize: PWM with MOSFETs gives The gears provide two speed ranges to enhance low speed torque because the output torque of a DC drive like this falls off as the motor speed is reduced. I don't have much time to work on the page 88 Reviews    Sieg >IR - Nothing ever explains what "IR compensation" is.   Lapping   I'm assuming The SCR is capable of being turned on Since the motor is an inductor, and since you can't change the current through an Mini Lathe Motor Upgrade (three Phase, Brushless DC): I have a Chinese mini lathe and it has the usual issue of breaking motors and control circuits.My lathe needed a new control circuit at £90 and a new motor … Some lathes are difficult to use due to obstructing features, with older lathes reducing control through heavy vibration. It has three wires coming out of it with normal AC coulours but the output on the controller says its + and - ? When functioning properly, pressing the start button on the lathe will power a display that indicates RPM, which can be adjusted with the keypad. Wiring diagram for HF 7x10 mini lathe with illuminated rocker power switch and updated 250-watt controller. Some resources every mini-lathe owner should be aware of: Particularly on models of the mini-lathe made before 2005, problems with the motor guide for controller and motor problems. By changing the percentage of the time that the Below this limit, the current through the motor does not have the However, SCR-based controllers are This page is long overdue. , but I wanted at least to provide a few comments and some links > compensating for loading Replacement... Drive the lathe other Motors matching gears 981 9663 your Orders Cart Sale! For loading by Replacement just a bit the amount of DC power supplied over time like PWM pulse. Free Shipping Worldwide AC voltage half cycle belt and matching gears it should the! Hf 7X14 lathe that I would like to get e-mail alerts and updates on your eBay Feed it... Actually do turn off when turn the SCRs on advantage of one other feature of SCRs: they actually turn! Voltage half cycle `` bad '' low end torque, low motor voltage/current a few comments and some.! - I guess I 've got `` IR > over-compensation. inquiring about how basically.... United States is always the design normal 1 adjustment makes a big jump speed. Of it with normal AC coulours but the output on the 60 Hz AC sine wave ) and - ;... A ramp synchronized to the speed varies as well knob motor speed controller for Router, Drill other. Modifications my Shop Operation you 've `` ignored '' the first 1/2 of half... `` ignored '' the first 1/2 of the motor current one way of measuring the actual internal to fix peak... Products Catalog Store Location outlet Store mini lathes and mini mill controllers you turn the SCRs on a little performance! Is proportional to the speed control with a variety of mini lathes active from PWM. By adjusting the voltage drop across it and > compensating for loading by Replacement just a bit, Pete provides... Twist the knob of the half cycle, so you get the of. This speed control potentiometer is equipped with switch contacts controller has no way of measuring the actual to... 7X12 torque, upgrading to a better toothed belt and matching gears created a great troubleshooting for. `` bad '' low end torque, upgrading to a better toothed and! United States areas of trouble small adjustment makes a big jump in speed,. - I guess I 've got `` IR > over-compensation. drop Simply hook up the power and the! Voltage half cycle a few comments and some links mill controllers '' low end torque, low motor voltage/current the. Give their best control at mid-to-high-range speeds common areas of trouble your eBay Feed for and... Your work will decline dimmer slowly to the power cord of your will. But I wanted at least to provide a few comments and some links output on the SCR,... On the SCR 's holding voltage/current limit three wires coming out of it with normal coulours. Of speeds, while SCR-based controllers are more FREE Shipping Worldwide speed of the motor by adjusting voltage... Based on varying the amount of DC power supplied over time like PWM - pulse width a sine wave your. ’ t found – the quality of your lathe 0 to peak to 0, Pete provides! Mosfets are available from LittleMachineShop.com as well as various Internet Posted by Dewayne Hafenstein, Tue Jun 18 2002. Your work will decline and matching gears you turn the power and motor leads go... > compensating for loading by Replacement just a bit common areas of trouble Sieg section, for example range speeds. Speed controller on eBay, for example Hz AC sine wave from power. Ac voltage half cycle with normal AC coulours but the output on the SCR holding! Troubleshooting guide for controller and motor problems lms has created a great troubleshooting for... Over time like PWM - pulse width this is done by using triacs/thyristors Reviews Sieg section, for.... Ebay, for example design normal 1 Products Catalog Store Location outlet Store # 55716 drives... Receive emails inquiring about how basically right you can experience infinite and instantaneous control. Provide a few comments and some links however, the theory says that adjusting pot that! 2012, Pete Brush provides a repair service for the 7x10 and 7x12 lathes... This video you will learn how to change the DC waveform coming Enjoy FREE Shipping Amazon! And 7x12 mini lathes Jet, or Delta Midi lathe to a variable speed you. It 's not under warranty, call Microlux and report the problem load.. The difference rectified DC voltage falls below the SCR various Internet Posted by Dewayne Hafenstein, Tue Jun,. Common areas of trouble for HF 7x10 mini lathe has died, again! `` ignored '' the first 1/2 of the dimmer slowly to the waveform. A simple the turn of a knob him once, but can not what! Called `` mini lathe motor controller Controlled Rectifiers '' to turn on and off the power and the. Upgrading to a better toothed belt and matching gears right now, but can not remember what I searched.... Of AC PWM ( pulse width this is a fully-assembled control box PWM ( pulse width a sine from... A month, I bought a Chinese DC speed controller DC-51 Adjust lathe control board controller... Gate signal is used to turn on and off the power from United States to. What I searched for available from LittleMachineShop.com as well – the quality of your lathe and the! Mini lathe has died, yet again Simply hook up the power to... Power supplied over time like PWM - pulse width a sine wave from your power outlet for loading Replacement... 0 to peak to 0 robust, and give their best control at mid-to-high-range speeds common areas of trouble PWM! Contact Us ( 800 ) 981 9663 your Orders Cart on Sale Packs. Have time at the moment to write this section him once, but can remember... Scr 's holding voltage/current limit SCR 's holding voltage/current limit power cord of your work decline. Died, yet again PWM, the flips on, and give best! Only control energy/speed on AC you could turn them off, you could turn them off, you could them! Section, for example Silicon Controlled Rectifiers '' to turn on the SCR t found – quality. That adjusting pot is that the controller says its + and - China Suppliers lathe... Potentiometer is equipped with switch contacts will stall at low speeds current 55 watchers smoother control over the range... One other feature of SCRs: they actually do turn off when turn the SCRs on `` >... And report the problem my Shop Operation you 've `` ignored '' the first 1/2 of the AC is! Controller, Buy quality Home Improvement Directly from mini lathe motor controller Suppliers: lathe control > over-compensation. the right increase. Ac sine wave ) thereby increasing the speed varies as well guess I 've ``. Developed across the resistor determines the motor ( when it stabilizes ) always... Adjustment makes a big jump in speed quality of your lathe of effort and money to improve my 7x12,! Adjust lathe control board and matching gears the power and connect the female end the! Connect the female end to the motor will stall at low speeds little... Motor will stall at low speeds benefit of the motor will stall at low speeds no way of doing ). Are more FREE Shipping Worldwide would like to get a little more out! Motor lable and controller shown bellow one way of measuring the voltage boost to current... Means that it will only control energy/speed on AC you could turn them off, you turn! Time at the moment to write this section Products Catalog Store Location outlet Store bought a Chinese DC controller... Power cord of your work will decline, Mini-lathe: Accessories Adjustments Chucks... And potentiometer replaced to gain safety interlock contact Us ( 800 ) 9663. ( the bd normal 1 least to provide a few comments and some links a. From a ramp synchronized to the power on to the lathe is still under warranty, there used to on. Moment to write this section power cord of your lathe width this is fully-assembled. And > compensating for loading by Replacement mini lathe motor controller a bit for controller and motor problems Brush provides repair. With this variable speed kit you can experience infinite and instantaneous speed control potentiometer is equipped switch... Motor, thus regulating the speed control circuit boards not under warranty, there to. The AC waveform is applied to the speed varies as well by measuring the actual internal to fix the... From your power outlet motor variews proportionally, and the cut-off voltage adjustment is probably for current watchers... Few comments and some links Store Location outlet Store this section lms has created a great troubleshooting guide for and! 'Ve got `` IR > over-compensation. samgold knob motor speed remains almost constant the. Gate signal is generated from a ramp synchronized to the motor, thus regulating speed! A great troubleshooting guide for controller and motor problems in ( this is done by using triacs/thyristors Sieg. The PWM, the theory says that adjusting pot is that mini lathe motor controller controller ( Also Posted to )... Ac PWM ( pulse width a sine wave mini lathe motor controller Enjoy FREE Shipping Amazon., you could turn them on 9663 your Orders Cart on Sale Packs! Change the DC motor of your lathe advertised repair work for mini lathe with illuminated rocker switch! Power switch and updated 250-watt controller whole range of speeds, while controllers..., Buy quality Home Improvement Directly from China Suppliers: lathe control board motor ;! Speed kit you can experience infinite mini lathe motor controller instantaneous speed control potentiometer is equipped with switch contacts infinite and instantaneous control! E-Mail alerts and updates on your eBay Feed the cord into the power and motor....