Brake Arcing tool

hi, I just wanted to share pic. of a brake shoe arcing tool I am making. will let you know the results when I do first set of brake shoes.

probable waiting for me to send you that set.

Will have tool finished tommorrow. 1 more part to make. The adjusting screw.

Here is another view of the tool.

Very cool tool 1983XC175! Definitely looking forward to some action shots of it cutting...

Can you explain how it will work.I've heard of the process,but can't picture how your set up does it. Thanks

If you look on Race tech web site under vintage, brake arcing you will see pics. You will understand..
Bill

I see and understand.You would have to open the brakes so their diameter is greater than the hub ID before cutting them.And you will never get 100% contact ,because you can't expand the shoes around the stationary lug.How much contact will you get,let us know.

Hi, Here is the latest pic. shown is a front Maico backing plate with no shoes.Hope to try it this week.
Bill

Bill, I need to see it in action.

Mike

Mike, may try it tommorow. Had a guy from work help me on the project .. joint effort.. hope it works.
Bill

Very cool tool. I wish I could fabricate. No such luck with my neanderthal abilities.

We probly have 12 to 15 hours in designing amd machining. Hopefully it is worthwhile. Thinking of offering a brake arcing service. People would send complete backing plate and axle , We would cut shoes. What do you all think?
Bill

He is the first try. Gripper brake shoes for a 1981 Maico. I cannot believe how far the shoes ran out of true before cutting. Worked very well.

What do I think? Wouldn't you want to shim the cam which pushes out the shoes to the exact spot it will be at when the shoes contact the drum. It has been my understanding and practice that you just pad the cam flats in some fashion and keep on using the shoes unless they look as if they will come unglued soon. I have been on a few rides where the whole inside of the brake drum was virtually mud. If you are reallly fussy wouldn't resurfacing the inside of the drum or machining it out and pressing in an iron liner actually be of more use to someone who rode these things a lot.

Fran

Very cool tool, 1983XC175. Very nice machine work.
I wonder how the job would turn out if you simply put the drum backing plate on a rotary table and cut the shoes on a conventional milling machine. It seems straightforward enough, assuming you make some sort of adapter to mate the backing plate to the center taper of the rotary table. Anybody have any thoughts on approaching it this way?

Fran,I dont know if you want to shim the cam, but you need to have it open. Yes, The cam is open on this 1. I will be measuring the brake drums and machining shoes .020" smaller. will keep opening cam for as much contact as possible.

I made a madrel and tryed it in a lathe. The interrupped cut kept wanting to throw shoes out. This unit is self contained and alot faster set up then conventional mill. you idea will probly work. I am sure there are many ways to do it.

Fran, you are correct. I would think that the brake lining run fairly true. Wouldnt the shim on the cam only be used if your brake shoes had a lot of wear on them? I am not sure what your last sentence means?
Bill

Bill, looks sweet. I understand now. Duh, very cool tool.

Mike