BobL
27th June 2016, 05:15 PM
In a previous thread (http://www.woodworkforums.com/f8/help-convert-nova-1624-lathe-206350#post1958888) I indicated that I was helping another member modify their Nova to run a on a VFD and outlined the problems.
After looking around for some time, said member has managed to purchase a near new 3P 2HP motor capable of easily being converted in the motor connect box to run on 240V 3P.
This post outlines the mechanical issues
This Nova uses a flange mount motor so it require the cutting out and fitting of a foot plate and providing some support for the plate.
Here is the 176 x 200 x 6 mm mm steel foot plate I made up.
I had a large piece (600 x 600) of 6mm steel plate which I didn't want to cut into so I welded the plate from a piece of 150 and 50 mm wide flat bar.
386032
The flange mount conveniently comes with 4 x 8mm threaded holes suitable for mounting a foot plate.
Given this is a bigger/heavier motor, and to reduce any possible flexing I added a small gusset to one side and trilled and tapped an 8mm thread into the side as shown.
A gusset could not be easily added to the other side as it would interfere with the main motor mounting bolt on the lathe itself.
386031
Now after a couple of coats of silver hammer tone paint
386033
386034
And here with motor mounted
I could have made the gusset a bit longer but this makes it easy to tighten the motor mounting bolts
386035
This shows the 2mm steel shim (green arrows) needed to centre the this motor's shaft in the middle of the flange.
386036
Next we will have to deal with the issue of the bigger (24mm) shaft on the motor and the 19 mm pulley on the Nova .
Solution 1 is to get/make a new pulley - the multi ribbed V pulleys are not cheap! ($100?)
Solution 2 is to bore out the old 19mm bore pulley - this is not really a good idea as it does not have enough metal to ensure a safe fixture to the shaft
Solution 3 is to bore out the old pulley and machine up a steel collar to fix around the the bored out shaft.
Solution 4 is to turn the motor shaft down and cut a keyway in the shaft.
I'm probably going to go with #3
After looking around for some time, said member has managed to purchase a near new 3P 2HP motor capable of easily being converted in the motor connect box to run on 240V 3P.
This post outlines the mechanical issues
This Nova uses a flange mount motor so it require the cutting out and fitting of a foot plate and providing some support for the plate.
Here is the 176 x 200 x 6 mm mm steel foot plate I made up.
I had a large piece (600 x 600) of 6mm steel plate which I didn't want to cut into so I welded the plate from a piece of 150 and 50 mm wide flat bar.
386032
The flange mount conveniently comes with 4 x 8mm threaded holes suitable for mounting a foot plate.
Given this is a bigger/heavier motor, and to reduce any possible flexing I added a small gusset to one side and trilled and tapped an 8mm thread into the side as shown.
A gusset could not be easily added to the other side as it would interfere with the main motor mounting bolt on the lathe itself.
386031
Now after a couple of coats of silver hammer tone paint
386033
386034
And here with motor mounted
I could have made the gusset a bit longer but this makes it easy to tighten the motor mounting bolts
386035
This shows the 2mm steel shim (green arrows) needed to centre the this motor's shaft in the middle of the flange.
386036
Next we will have to deal with the issue of the bigger (24mm) shaft on the motor and the 19 mm pulley on the Nova .
Solution 1 is to get/make a new pulley - the multi ribbed V pulleys are not cheap! ($100?)
Solution 2 is to bore out the old 19mm bore pulley - this is not really a good idea as it does not have enough metal to ensure a safe fixture to the shaft
Solution 3 is to bore out the old pulley and machine up a steel collar to fix around the the bored out shaft.
Solution 4 is to turn the motor shaft down and cut a keyway in the shaft.
I'm probably going to go with #3