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Hardinge TFB conversion to CNC
Posted: Sat Jan 01, 2022 10:48 am
by jshank
Hi,
I am trying to gather information to start a Hardinge TFB project. I have received good information on ball screws and the installation. I am planning on using a Centroid allin1dc as I have experience with this board on my Bridgeport Boss machine.
The question is what size dc servo motor should be used on the z-axis and what size on the x-axis.
Re: Hardinge TFB conversion to CNC
Posted: Sat Jan 01, 2022 12:01 pm
by polaraligned
Can you measure the motors that are on the X and Y now and see if they are a standard NEMA mounting pattern? Maybe you can get a motor to fit in their place. Also, check to see if the current motors have gear heads built in or there is some other gearing in the motor drive train. I don't think they drive the existing leadscrews directly. Any existing gearing will have too much backlash, but you can probably get a good idea of what you can do to drive the leadscrews. Your gearing is going to matter. Personally, I would go with a 2:1 belt drive reduction and 12 to 15 in-lb servo. Those are good machines for a conversion because they don't come with threading, but many that I see are well worn as they were used in production often.
Re: Hardinge TFB conversion to CNC
Posted: Sat Jan 01, 2022 1:15 pm
by tblough
I'd go with a Centroid 10in/lb servo on X and a 16in/lb servo on Z.
Centroid DC Servo Motors with encoder and cable installed (middle of page)
Remember, this is a light-duty high-precision toolroom lathe. You not going to be hogging material with this machine so huge servos are not needed.
Space on X is also a consideration if you are going to fit everything on the carriage down into the existing chip tray. Not as big an issue if you intend to build up.