Re: frame restoration


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Posted by Paul (in NY) [12.64.102.208] on Thursday, May 16, 2013 at 20:34:42 :

In Reply to: frame restoration posted by Jon Kelly [99.65.238.15] on Thursday, May 16, 2013 at 20:13:26 :

The following is a post I made on removing the rear brake backing plated, ie removing the rivets. The same procedure works well on frame rivets. Its not a fun job, but I find this method is quick and the easiest way I have found. Depending on the rivet, you may need to adjust the drill sizes.

Paul

" I used this method every time and can remove a backing plate in less than 15 minutes.

1. Take a 4.5" angle grinder with a 1/16" kerf cutoff wheel. With the angle grinder and cutoff wheel come in from the outside of the backing plate parallel with the backing plate and cut the head off the rivet as close as possible.

2. With the angle grinder and a flap type abrasive grinding disk,

grind the end of each of the 5 rivets smooth where you just cut the head off.

3. You will now see the outline of the .500" rivet that has to be removed. Get dead center on each rivet and make a nice deep center punch.

4. Now with a drill your going to drill into the rivit body towards the rear of the rivet. Start with a 1/8" drill bit. Drill the first hole .500" deep. The with a 1/4" drill bit open the hole to 1/4", then with a 5/16" drill bit open the hole to 5/16" and finally with a 3/8" drill bit open the hole to 3/8". Each time you enlarge the hole, be sure to drill all the way to the bottom of the

first pilot 1/8" hole.

5. You will now have a hole, 3/8" diameter x 1/2" deep. Use a pair of Large Vise Grips to hold the 3/8" punch so you eliminate the chance of hitting your fingers. Take a 3/8" FLAT nose punch and insert the end in the hole. Now with SAFETY GOGGLES, GLOVES and HEARING PROTECTION, take a hand sledge and wack the punch. The first blow will have a ring, the second and third blows will have a muffled thud as the rivet moves out. I find it takes about 4 blows and the rivet is out. The backing plate will fall off.

The reason for drilling the holes, ending with 3/8" x .500" deep is this. If you try to drive on the flush rivet body, each blow will cause the rivet to expand just a little in the already tight hole. The more you have to drive on it, the more you expand the rivet and make it even tighter.

By drilling .500" deep hole, 3/8" deep you are driving on the inside of the rivet deep enough that any expansion will not expand the rivet and bind it in the hole.

Although the above procedure details rivet removal on Brake Backing Plates, it also work equally as well on Frame Rivets.



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