Mainspring, Re-holing •

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bangster

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1. Cut off old hole

remove old hole.jpg

2. Clamp the spring in a vise for a heat-sink. Anneal a couple of inches of the end of the spring. Heat to cherry red, then withdraw flame slowly. If it cools too fast it may air-harden. Let it cool on its own; don't quench it.

anneal 1.jpg

After annealing.

after annealing .jpg

3. Round the end of the spring.

round end.jpg


4. Center punch the location for the hole.

center punch .jpg

5. Drill the hole.

IMG_1253.jpg

6. Re-shape the hole with a Dremel. As you can see, I use a flex shaft, diamond bit.

reshape hole.jpg

7. Re-shaped hole should look something like this.

reshaped hole 1.jpg reshaped hole 2.jpg



8. Make a sharp, straight bend at the front edge of the hole. The corner of the bend —and therefore the front edge of the hole— will press against the inside of the barrel, making it easier for the barrel hook to grab it.

bending tip .jpg

9. The final product.

bend.jpg final product 2.jpg

remove old hole.jpg anneal 1.jpg after annealing .jpg center punch .jpg reshape hole.jpg round end.jpg reshaped hole 1.jpg reshaped hole 2.jpg bending tip .jpg bend.jpg IMG_1253.jpg final product 2.jpg
 
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harold bain

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Re: Bang,s tutorial on re holing a main spring.

You know, Bang, before I had that spring catch in the drill bit, I probably would have been OK with just using the drill press and a drill bit. But many of our new members don't have a lot of shop experience, and may be more likely to have the drill catch the spring than you and I are.
Here's a few pictures showing how I make a new hole, using a punch, and a pair of tin snips.
1. Trim and round off the end, using the snips and a bench grinder.
2. Select hole size (I used a 9/32" bit).
3. Line up punch to put the hole where you want it.
4. Punch the hole.
5. Dress the hole to as close to the shape of the old hole as you can make it. A dremel, or a hand file can be used for this. Also make sure the hole and the end are free of burrs.
Have a close look for any cracking on the spring, then lube and install in the barrel.

==============
Thanks Harold; this contribution is more valuable than everything presented in the discussion thread.
------------
bangster
 

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bangster

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Re: Bang,s tutorial on re holing a main spring.

Since making this tutorial, I've bought me a punch like the one Harold uses. Not too pricey, and a lot easier than drilling.

Note: Anneal before you punch.
 
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