[How-To] Green Mini Lathe

[Randyryang]

Not sure if this is the correct category for this question. But, can anyone help my identify the make and model of my lathe? Pretty sure its a 7x10 by the bed length. I need to order some parts but I have no idea what brand it is. I have been told its an old Sieg. But the HF models look like an exact match also. I would also like some tips on upgrading the motor and or speed control. I have made repairs to the existing speed control box. But I still have no speed control. I do not have a full picture of it on my phone, I will post one here as soon as I get back home this evening.


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[addertooth]

Start with littlemachineshop.com. They have all kinds of parts for Sieg family lathes.

I would suggest you post some pictures of your lathe, especially with any pictures of the labelled plates on it. Include a picture of the backside.

 

[Ulma Doctor]

the OEM boards were less than stellar.
considerations may be made to retrofit a stronger mainboard like an MC40, MC60, KBC etc.

 

[Randyryang]

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[Randyryang]

Pic from the front side.


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[Ulma Doctor]

the lathe is a central machinery 7x10, i owned one many moons ago.

if you are gonna go to the trouble of retrofitting power plants and control system,
i would consider a 1/4 to 1/2 HP 3 phase motor and VFD
but you could very well use the stock motor and upgrade the controls as mentioned earlier

 

[Ulma Doctor]

a simple PWM board could be used in place of the OEM control like these:

12V 24V 48V 2000W 10-50V 40A DC Brush Motor Speed Control PWM HHO RC Controller | eBay

Rated current: 40A Maximum output current. PWM Regulation range:5-100%. It is fit all kinds of general-purpose and have a DC motor speed with brush. PWN Frequency : 200hz. All kinds of dc lamp was dimming, all kinds of dc heater adjust the temperature.

www.ebay.com

PWM DC Brush Motor Stepless Variable Speed Controller Switch 12V 24V 48V 60V 20A | eBay

Suitable for the DC motor (or DC load) within 20A. PWM frequency: 25kHz; Duty Cycle adjustable: 5%-100%. TO CHANGE MOTOR DIRECTION, INTERCHANGE THE POSITIVE AND NEGATIVE WIRES OF MOTOR. Adjustable speed range is from 0%-100%.

www.ebay.com

PWM Fan DC Motor Speed Controller Module 1200W 20A DC 12V/24V/36V/48V 25KHZ Kit | eBay

Find many great new & used options and get the best deals for PWM Fan DC Motor Speed Controller Module 1200W 20A DC 12V/24V/36V/48V 25KHZ Kit at the best online prices at eBay! Free shipping for many products!

www.ebay.com

6V-90V 15A PWM DC Motor Speed Control PWM Controller 12V 24V 48V 64V 72V 1000W | eBay

The maximum output power: 1000W. PWM frequency: 15kHz. The maximum continuous output current: 15A. The overload and short circuit protecting current is 20A. Duty Cycle adjustable: 0%-100%. NOTE : This can NOT be used to the BRUSHLESS motor.

www.ebay.com

PS. I like the special tool sitting on the bench behind the lathe!

 

[tech610]

99.99% that it is HF 93212. I have one circa 1999. They were green back then. I bought all the parts for it from Grizzly.

7" x 12" Mini Metal Lathe

<h1>G8688 7" x 12" Mini Metal Lathe</h1> <h2>A great starter lathe offered at an incredibly low price!</h2> <p>Powered by a 1/3 HP motor, the 7" x 12" Mini Metal Lathe cuts right-handed and left-handed threads while easily fitting on your bench so you can machine your own parts.</p> <p>The G8688...

www.grizzly.com

Any special parts for it like metal headstock gears I bought from LMS.

 

[Randyryang]

Thanks for all of the tips, this helps a ton! Wouldn’t I need a brushless DC motor to use a PWM controller? Definitely needs more power for sure. I have already purchased and installed a new metal gear set in the head stock from LMS.


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[tech610]

Upgrading motor and PWM controller will put you on a slippery slope of making a 7x into what it will never be.
I put a lot of effort and money to improve my 7x12 torque, upgrading to a better toothed belt and matching gears. Don't be fooled by it swing size.
One stall while cutting a large stock, especially on a faceplate when the tool digs in and you are looking for a new controller. You have metal headstock gears so the only thing now that protects your controller is a fuse. I went down to 2amps fuse and I keep a good supply of them, but even that doesn't guarantee that your controller will be safe.
The money that I spend on my 7x12 would pay for half of my new 9x20 lathe that I eventually bought. I still use my 7x12, but not for any work that might kill it.