Repost: Speed Reducer Disconnect

ldlinford · Post by **ldlinford** » Tue Feb 05, 2013 11:23 pm

I tried to post this question on Feb 1, but it apparently did not get posted. So here goes again:

When I use my new speed reducer (Mark V) in roughing out irregular shaped pieces, it shakes and vibrates itself loose from the head stock. This happens every 2 or 3 minutes.

Does anyone have any suggestions as to how to remedy this?

Thanks.

LDLinford

JPG · Post by **JPG** » Wed Feb 06, 2013 12:10 am

Are you clamping it to the way tubes?

reible · Post by **reible** » Wed Feb 06, 2013 1:36 am

You are not giving us to much to go on here.

Have you attempted to balance the piece some before mounting? Bandsaw, chainsaw, handsaw to get it to say 8 sided or rounded for a bowl?

The speed reducer is locked at the quill side and the clamp is tightened to help hold it in place on the tubes.

The more unbalanced the work piece the slower you must start, use low on the shopsmith.

Machine sitting on a flat location and off the casters?

What are you using to drive/mount the piece? Faceplate, screw, ???

Are you using the tail stock? If so make sure the headstock is locked in position, the workpiece is tight between centers and as mentioned before the clamp on the speed reducer is tight. Nothing should move.

Are you setting up for the cut by getting the tool rest up close but not touching? Roughing gouge? Height just above center. Tools sharp. Taking light cuts and having control of the cut?

Own the universal lathe tool rest?

Just how big is the piece you are working on?

Pictures can be helpful if you can provide them.

I know, not much help just a bunch of questions...

Ed

SDSSmith · Post by **SDSSmith** » Wed Feb 06, 2013 9:30 am

I would remove the blank you are turning and run the speed reducer without it to isolate the source of the problem.

terrydowning · Post by **terrydowning** » Wed Feb 06, 2013 11:12 am

What all have said so far. I put a 12" log on with the speed reducer to make it round. I ran it at the lowest speed until it was round and balanced. Very little vibration at the lowest speed. Once it was balanced, I increased the speed. In general larger pieces should be turned slower. The RPM is measured at the spindle, add 12 - 16" to that and the tip velocity gets pretty wicked.

charlese · Post by **charlese** » Wed Feb 06, 2013 12:24 pm

What SDSSmith said - - Let the speed reducer run without attachments.

I was very sensitive to vibration of the Speed reducer when using it attached to the bandsaw to reduce vibration. I found when first started up, the SR had some vibration (more like shaking). Thinking it may be caused be set in the two poly-V belts, I let it run for a while until it heated up a bit. The shaking got less as it ran. So I thin my guess was correct.

The Speed reducer has two poly-V belts that could take a set after sitting on the shelf for a long time.

Also suggest you re-read the Speed Reducer manual an make sure all parts are secured.