- Joined
- Dec 22, 2011
- Messages
- 715
I've spent the winter refurbing / rebuilding / repainting my Rockwell mill. One of the items that needed to be replaced was the brake shoe. The cam had worn the contact surface of the old one to the point it wouldn't hold.
I ordered a 6" square of Garolite LE x 1/2" thick from McMaster Carr. This is nasty stuff to work with - almost like wood with lots of dust. I started off by first drilling a reference hole in the center and then knocking the corners off with a scroll saw.
Then I mounted it in my four jaw chuck and centered it up using the reference hole. Next I drilled the hole big enough that I could use a boring bar.
I bored it out to just over 1 1/2" to fit my duplicate spindle plug that I made when making my ER collet chuck. The plug is sitting on the cross slide.
Next I put the plug in the four jaw and centered it. Then I put the brake shoe on the plug and used my ER collet chuck as a net to secure it, and turned the outside to fit my pulley.
The next step was to face to the correct thickness and bore the ID to the correct dimension.
I was struggling with how to cut the slot for the cam. I finally decided my little Unimat was up to the task, so I made some brackets and clamps and let the dust fly.
And the finished product:
It seems to fit the pulley and the cam fits in the slot. I think she'll work just fine.
Thanks for looking.
Steve
I ordered a 6" square of Garolite LE x 1/2" thick from McMaster Carr. This is nasty stuff to work with - almost like wood with lots of dust. I started off by first drilling a reference hole in the center and then knocking the corners off with a scroll saw.
Then I mounted it in my four jaw chuck and centered it up using the reference hole. Next I drilled the hole big enough that I could use a boring bar.
I bored it out to just over 1 1/2" to fit my duplicate spindle plug that I made when making my ER collet chuck. The plug is sitting on the cross slide.
Next I put the plug in the four jaw and centered it. Then I put the brake shoe on the plug and used my ER collet chuck as a net to secure it, and turned the outside to fit my pulley.
The next step was to face to the correct thickness and bore the ID to the correct dimension.
I was struggling with how to cut the slot for the cam. I finally decided my little Unimat was up to the task, so I made some brackets and clamps and let the dust fly.
And the finished product:
It seems to fit the pulley and the cam fits in the slot. I think she'll work just fine.
Thanks for looking.
Steve