Need a small punch die made

M

Mutt

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I need to find someone that can machine me a punch/die set up that will punch these discs from .032 sheet brass.
The center hole is .143"
The o.d. is not round.
It goes from .808 on 2 sides to .838 on the opposite 2 sides so it's oval.
If that isn't do-able does anyone here have a laser, water jet or cnc router that can cut these?
This is the last new one I have and I need some more ASAP I have new brass sheet in stock
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DSCF1926.JPG
 
Sorry @Mutt,

No real advice from me, except to read some of @BGHansen 's posts of punches and dies.

They will either (or both):
1) convince you that you can try it yourself, or
2) teach you a bunch of the basics so you can talk very knowledgeably about it when you find someone to make them.

Here's a start:
https://www.hobby-machinist.com/thr...umber-ed-triple-drum-hoist.60155/#post-613497
https://www.hobby-machinist.com/thr...-number-nu-parachute-men-punch-and-die.59615/
https://www.hobby-machinist.com/threads/gilbert-erector-set-part-number-gn-airplane-swivel.74030/

-brino
 
How many pieces do you need?
 
brino said:
Sorry @Mutt,

No real advice from me, except to read some of @BGHansen 's posts of punches and dies.

They will either (or both):
1) convince you that you can try it yourself, or
2) teach you a bunch of the basics so you can talk very knowledgeably about it when you find someone to make them.

Here's a start:
https://www.hobby-machinist.com/thr...umber-ed-triple-drum-hoist.60155/#post-613497
https://www.hobby-machinist.com/thr...-number-nu-parachute-men-punch-and-die.59615/
https://www.hobby-machinist.com/threads/gilbert-erector-set-part-number-gn-airplane-swivel.74030/

-brino
Click to expand...
Thanks for the links. I already make dies/punches for flat washers, but since this is oval, it's beyond my capabilites.
 
Mutt said:
I need 50 pieces. This 1' x 1' sheet should easily made twice that many
Click to expand...

At 50 pieces, that's a good candidate for laser cutting, and probably what I would do. There are a few laser shops in your area.

A little hard to hang on to when trying to machine with a mill or router. There are ways to do it, but a little tricky.

If you are already set up for punching, then making a punch & die would almost make sense. For small punches like that, I just have them made by Dayton-Progress https://www.daytonlamina.com/sites/default/files/doc/910_Kommercial.pdf Cheaper than making them in my shop. They'll make any shape you want.
 
I think yours is a standard shape, (maybe a C41) so it may be in the $150 - $300 range for the set. I bought 7 small punches and mating dies from the a couple years ago, and I think it was about $300 including shipping. They normally have about 2 day turn around.
 
A CNC mill would also do the job. I would use super glue and blue tape for work holding and cut the profile in several passes with the last pass being .005" deep to minimize cutting forces. I would drill all the holes as a first op and if necessary insert pins in the holes to help stabilize the work.

Fifty pieces seems like a small lot to justify making custom punch/die sets.
 
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