speed changer help

[chapmanruss]

gary,

It's looking good.

In your first picture you have the inward spring almost completely compressed. Once the spring starts to compress you are no longer changing the speed (in this case increasing it) but are putting pressure on the parts that the spring is there to help protect. If you were going to the slower speed, for either high range or low range, the outside spring would begin to compress as you reach the minimum slow speed. ONCE THE SPRING BEGINS TO COMPRESS STOP CRANKING. Continued turning of the crank past the maximum or minimum speeds will continue to compress the spring and eventually cause something to break. Most often it is one of the "dog ears" that the Crank Assembly attaches to that breaks off. The picture below, which I have previously posted, shows what happens. Do note that in this case no protection against over cranking from the springs is present because the nut was too far on the threaded end of the shaft (indicated by the arrow) already compressing the springs. Yours is well set having just the end of the threaded shaft "peeking out" from the lock nut.

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broken ear arrow.jpg (179.54 KiB) Viewed 3076 times

[myfathersworkshop]

Russ, I'll watch the spring compression. I'm not sure I'll have reason to run this full tilt anyway, but it was nifty getting it to spin up to lickety split. I still have some fine tuning to do and switching from low range to high isn't very smooth yet, but this is really a very useful attachment. I'm real grateful for you, jpg and all that lent expertise to this adventure. I have a new respect for my Shopsmith that has been with me for over 40 years. Also grateful to Skip at MKC and HogWinslow 1960 (Tom?) for having the parts available.

[JPG]

The reason the high speed spring is compressed is the belt has bottomed out(no ability to move further).

Yes 6800 rpm can be scarey.


Interesting tool rest mount.

[GetterDone]

I really like your setup.

I am admiring your New Pulleys.

I have a speed changer to rebuild myself so I have been taking notes.

[myfathersworkshop]

"Interesting tool rest mount."

GetterDone- Thanks and I hope your rebuild goes smooth, there is certainly plenty of help.

[chapmanruss]

It is an interesting Lathe Tool Rest assembly somebody made.

I also noticed the 8" Tool Rest itself was broken and repaired at some point. One of the Tool Rests I got with a Model 10 I restored had the post broken off in a similar fashion, but I didn't repair it. I replaced it with a non-broken one. I also had another one which had been repaired. The post brazed back on the Rest.

Since nearly the beginning of the Shopsmith 5 in 1 Tool that 8" Lathe Tool Rest has looked the same. You can buy a current 8" Lathe Tool Rest and use it on any Mark series or Model 10 Shopsmith. The Arm and Post have changed over the years and vary some by models.

The original Lathe Tool Rest itself for the first Model 10E's was a two-piece assembly having the post screw into the 8" Rest casting. Just a little Shopsmith history for today.

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105-1 Tool Rest - top.jpg (211.38 KiB) Viewed 2997 times

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105-3 Post.jpg (265.23 KiB) Viewed 2997 times

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[myfathersworkshop]

Wait, you mean the maple blocks aren't stock?

Actually, I don't remember how that came about... I remember making the blocks so I could use the lathe, but I don't know why the original tool rest wasn't correct or why it wasn't working properly.