06-26-2018, 09:43 PM
Hi all,
I have just done the common gearbox rebuild on my RF-45 clone, changing the gear shaft bearings, oil seals, etc. I did not change the spindle bearings.
I am having trouble getting the quill fine feed mechanism to work. The rack mechanism works ok.
It used to work before, albeit with a tight spot.
It seems to me the large worm wheel that engages with the fine feed worm only meshes properly and works smoothly when it is in a very specific position. The worm wheel no longer ends up in this position when I put it back together now - it gets pushed in too far to the left and binds solid. I have looked at every variation of the manual I can find and none of them show any parts I don't have - the only variation is in the washer and screw parts that hold the return spring on which I do not think is relevant.
In desperation I made some spacers to go between the shoulder on the pinion shaft and the worm wheel - I've ended up with 8mm and could perhaps use another 1mm, but it works ok.
The mechanism also seems to get a bit tighter as the screw holding the return spring cover to the pinion shaft tightens up while the pinion shaft rotates. I guess this screw has always rotated with the shaft and I just never noticed. It's pretty loose at the moment which is why it tightens a bit. If I tighten this screw right up it clamps the whole quill lowering mechanism, both fine feed and using the handles like a drill.
So it feels like the pinion shaft is being pulled way too far to the left, but the return spring hooking onto the screw on the left hand side doesn't give a lot of room to move.
I'd love to know what I've messed up. Has anyone else experienced problems when putting the fine feed back together?
Regards, David.
I have just done the common gearbox rebuild on my RF-45 clone, changing the gear shaft bearings, oil seals, etc. I did not change the spindle bearings.
I am having trouble getting the quill fine feed mechanism to work. The rack mechanism works ok.
It used to work before, albeit with a tight spot.
It seems to me the large worm wheel that engages with the fine feed worm only meshes properly and works smoothly when it is in a very specific position. The worm wheel no longer ends up in this position when I put it back together now - it gets pushed in too far to the left and binds solid. I have looked at every variation of the manual I can find and none of them show any parts I don't have - the only variation is in the washer and screw parts that hold the return spring on which I do not think is relevant.
In desperation I made some spacers to go between the shoulder on the pinion shaft and the worm wheel - I've ended up with 8mm and could perhaps use another 1mm, but it works ok.
The mechanism also seems to get a bit tighter as the screw holding the return spring cover to the pinion shaft tightens up while the pinion shaft rotates. I guess this screw has always rotated with the shaft and I just never noticed. It's pretty loose at the moment which is why it tightens a bit. If I tighten this screw right up it clamps the whole quill lowering mechanism, both fine feed and using the handles like a drill.
So it feels like the pinion shaft is being pulled way too far to the left, but the return spring hooking onto the screw on the left hand side doesn't give a lot of room to move.
I'd love to know what I've messed up. Has anyone else experienced problems when putting the fine feed back together?
Regards, David.