Lathing on the lefthand side? Outboard?

dkerfoot · Post by **dkerfoot** » Tue Dec 08, 2009 9:31 am

If one needed to turn a platter or shallow bowl bigger than 16" using the speed reducer, I snapped a picture of the SS configured for outboard work.

It is a little hard to see because of the cluttered background, but as setup, the max swing would be about 32" - way, way bigger than what I would ever attempt, but if I needed a 17" platter I'd think about it...

I think the Rockwell Jawhorse might make a good base for outboard turning. Just clamp the tool rest assembly in it jaw and go to it.

A serious issue to consider regarding outboard turning is the torque created. Normally the force of the workpiece against the tool is transmitted down against the tool rest, which being connected to the SS, counteracts the force transmitted upward through the workpiece.

Because the tool rest would not be connected to the SS, all of the force is applied against the workpiece, making the SS tend to lift up in the front right corner and roll backward. I would proceed a a very slow speed with a light touch until I had determined how stable the setup was.

SDSSmith · Post by **SDSSmith** » Tue Dec 08, 2009 3:55 pm

I like it. Then you can bring in your second Shopsmith 90 degrees to it to provide a tool rest.

dkerfoot wrote:If one needed to turn a platter or shallow bowl bigger than 16" using the speed reducer, I snapped a picture of the SS configured for outboard work.

It is a little hard to see because of the cluttered background, but as setup, the max swing would be about 32" - way, way bigger than what I would ever attempt, but if I needed a 17" platter I'd think about it...

I think the Rockwell Jawhorse might make a good base for outboard turning. Just clamp the tool rest assembly in it jaw and go to it.

A serious issue to consider regarding outboard turning is the torque created. Normally the force of the workpiece against the tool is transmitted down against the tool rest, which being connected to the SS, counteracts the force transmitted upward through the workpiece.

Because the tool rest would not be connected to the SS, all of the force is applied against the workpiece, making the SS tend to lift up in the front right corner and roll backward. I would proceed a a very slow speed with a light touch until I had determined how stable the setup was.

mickyd · Post by **mickyd** » Tue Dec 08, 2009 5:35 pm

dkerfoot wrote:If one needed to turn a platter or shallow bowl bigger than 16" using the speed reducer, I snapped a picture of the SS configured for outboard work........

Other than the quill, what is holding the speed reducer in place? Looks like it's floating. (newbie asking the question with no speed reducer mounting knowledge)

SDSSmith · Post by **SDSSmith** » Tue Dec 08, 2009 5:38 pm

Maybe this will help......
http://www.shopsmith.com/ownersite/cata ... educer.htm

mickyd wrote:Other than the quill, what is holding the speed reducer in place? Looks like it's floating. (newbie asking the question with no speed reducer mounting knowledge)

mickyd · Post by **mickyd** » Tue Dec 08, 2009 6:11 pm

SDSSmith wrote:Maybe this will help......
http://www.shopsmith.com/ownersite/catalog/speedreducer.htm

I had gone there and it still wasn't clear to me looking at the photo. I actually had to watch the video to see that it clamped to the way tubes. I like the rpm's indicated in D.

100700 at the reducer end!!

SDSSmith · Post by **SDSSmith** » Tue Dec 08, 2009 7:41 pm

mickyd wrote:I had gone there and it still wasn't clear to me looking at the photo. I actually had to watch the video to see that it clamped to the way tubes. I like the rpm's indicated in D. 100700 at the reducer end!!

Punctuation can provide clarity. Some people do better with pictures. If you had kept reading though, you would have seen "Attaches at three points to the MARK V’s Spindle and its two Way Tubes for vibration-free operation." You can also use it to slow down the bandsaw for cutting materials other than wood.

mickyd · Post by **mickyd** » Tue Dec 08, 2009 8:01 pm

SDSSmith wrote:Punctuation can provide clarity. Some people do better with pictures. If you had kept reading though, you would have seen "Attaches at three points to the MARK V’s Spindle and its two Way Tubes for vibration-free operation." You can also use it to slow down the bandsaw for cutting materials other than wood.

I guess I was looking for the hit and run. 2nd to the last sentence was a bit too deep for that. Plus, between the specified 100K "reducer" rpm and looking at the guys fingers between the tool rest and the burl, I think I probably lost my focus.

Have you played around with ER10 pulley retrofit to bring the rpm's down eliminating the need for a Mark V style speed reducer? You mentioned the approach it in a prior post.