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914World.com _ 914World Garage _ OT- Drill press
Posted by: jeffdon Aug 9 2016, 09:24 AM
I have an old 15" Walked turner drill press that dates back to the 40's. It's a wonderful beast of a cast iron machine, but the pulley that goes on the quill is messed up. The bronze splinned bushing inside was slipping. But I am a smart guy, and taking inspiration from the method we use to put the cam gear on a type 4 crank, I heated it up on a hot plate thinking I could then drive the bushing in tighter.
I ended up melting the largest diameter step off the pulley. 
I have not been able to source a replacement. Got to thinking, since I am trying to run at a lower speed, why not just get a motor controller and turn down the speed?
Any one know if this would work, and a good place for a speed control?
Posted by: toolguy Aug 9 2016, 09:38 AM
It's called a VFD. . Variable frequency drive
Posted by: jeffdon Aug 9 2016, 09:52 AM
It's called a VFD. . Variable frequency drive
Thanks. Will this in any way cause damage to my motor if I use it at reduced speed all the time?
Posted by: stugray Aug 9 2016, 09:54 AM
I have a 3-phase 3/4 hp Baldor motor on my fish tank pump using a 1hp single phase VFD.
It converts single phase to 3-phase and you can adjust the speed with a potentiometer.
I got it from a place like automationdirect.com but I would have to look through my notes.
I am taking down the fish tank and cant decide if I want to put the motor on my drill press or my attic fan :-)
Posted by: MrKona Aug 9 2016, 10:16 AM
Have you put a WTB ad on OWWM.com? If you haven't checked out that site yet, you should. It's to old tools, as this site is to 914s..
Posted by: worn Aug 9 2016, 10:18 AM
I have an old 15" Walked turner drill press that dates back to the 40's. It's a wonderful beast of a cast iron machine, but the pulley that goes on the quill is messed up. The bronze splinned bushing inside was slipping. But I am a smart guy, and taking inspiration from the method we use to put the cam gear on a type 4 crank, I heated it up on a hot plate thinking I could then drive the bushing in tighter.
I ended up melting the largest diameter step off the pulley.
I have not been able to source a replacement. Got to thinking, since I am trying to run at a lower speed, why not just get a motor controller and turn down the speed?
Any one know if this would work, and a good place for a speed control?
I would run the motor as it was designed and fix the problem. Is the part with the splines still OK? If so you can have a machine shop put it into a step pulley. It will not cost a lot and it will save the function and originality of an excellent tool. You could do it yourself...if you had a drill press
If you do go variable speed, try to find a motor designed for it. That would cost though.
Posted by: DavidSweden Aug 9 2016, 10:47 AM
It's called a VFD. . Variable frequency drive
the variable speed drive (VSD) should work fine and they are cheap. A single phase VSD can run a 3 phase motor but you need to be sure what your buying . You will need to set it up but its not brain surgery. you can usually use a variable resistor to control the speed.
I recommend installing an emergency stop button.
Good luck
Posted by: Mark Henry Aug 9 2016, 11:11 AM
I take that it's a cast aluminum pulley?
Can you machine it down and then thread and bolt on a steel weld-on style pulley with no hub?
Tractor supply will likely have one.
Posted by: jeffdon Aug 9 2016, 11:33 AM
I take that it's a cast aluminum pulley?
Can you machine it down and then thread and bolt on a steel weld-on style pulley with no hub?
Tractor supply will likely have one.
You know, I was just in tractor supply thinking the same thing. I take it you are thinking to drill 3-4 holes radially?
Posted by: jeffdon Aug 9 2016, 11:34 AM
Have you put a WTB ad on OWWM.com? If you haven't checked out that site yet, you should. It's to old tools, as this site is to 914s..
Awesome, thanks. Will check it out.
Posted by: Mark Henry Aug 9 2016, 11:51 AM
I take that it's a cast aluminum pulley?
Can you machine it down and then thread and bolt on a steel weld-on style pulley with no hub?
Tractor supply will likely have one.
You know, I was just in tractor supply thinking the same thing. I take it you are thinking to drill 3-4 holes radially?
Need to see it.
Posted by: MrKona Aug 9 2016, 11:52 AM
Have you put a WTB ad on OWWM.com? If you haven't checked out that site yet, you should. It's to old tools, as this site is to 914s..
Awesome, thanks. Will check it out.
Also, check out the classifieds on OWWM.org. (Note the .org versus .com). The two sites are affiliated... how I'm not sure. I think you need to register to access the classified ads. Great sites.
Posted by: jeffdon Aug 9 2016, 12:06 PM
I take that it's a cast aluminum pulley?
Can you machine it down and then thread and bolt on a steel weld-on style pulley with no hub?
Tractor supply will likely have one.
You know, I was just in tractor supply thinking the same thing. I take it you are thinking to drill 3-4 holes radially?
Need to see it.
Damaged pulley at the top. New (but wrong size) pulley at bottom. Could one of the proper size be attached in a way that works?
Attached image(s)
Posted by: Mueller Aug 9 2016, 12:21 PM
Post pictures of damage. Maybe it's something we can fix at my place.
You can also convert to a DC motor with a variable power supply....which I have 2 or 3 setups I've taken off of free/salvaged threadmills. Free for the asking if want to pick one up. I think 1 or 1.5hp motors.
Check out Surplus Center . Com, I bought my pulleys for my Bridgeport mill from there.
Posted by: jeffdon Aug 9 2016, 12:35 PM
Post pictures of damage. Maybe it's something we can fix at my place.
You can also convert to a DC motor with a variable power supply....which I have 2 or 3 setups I've taken off of free/salvaged threadmills. Free for the asking if want to pick one up. I want to 1 or 1.5hp motors.
Check out Surplus Center . Com, I bought my pulleys for my Bridgeport mill from there.
Its pretty bad. Anyone know if the splined bushing inside just presses out?
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