Manufacturing Spring Washers

I can supply -how much quantity do you need

Regards

N. L. Modha

Sawstik Electrical engineering co.

I would be concerned at asking you to make these washers when you do not know how to make them. Do you have Quality Control?

That also in large numbers

I will rather ask does the customer have a vendor evaluation system ? Answer :

Punch and split. With the proper punch & die you can do both in one step. Are you making enough quantity to make the punch & die fabrication feasible? Will the order be potentially repeated at a later date? Are you heat treating the washers or are you having that done for you by a vendor (affects cost) or are you using spring stock? Is the customer willing to pay for the punch & die? Another thought, multiple dies would cut production time and labor costs. Dies would be more expensive though. There are a lot of factors to consider. I definitely would not recommend winding your own springs and then trying to split them. This would be very time consuming. It may be possible to take spring stock and run it through a die and have the finished product in one step. We did this with blue spring stock for some parts we manufactured for our machines. We never punched .130" stock though. That's pretty thick for punch & die to handle repeatedly but I may be wrong.

Hello, Thank you for your educated reply. I have sourced trapezoidal stock which is the standard profile shape for this type of spring washer and have formed the washers in a helical spring like fashion. I needed to disqualify punching as an option. I have a few professional heat treaters that I use for all my injection mold cores, cavities, lifters etc and they can certainly handle the volume.

I have set up fixtures to grind the spring flat, so as to Rockwell test it correctly. I have already met all the necessary standard tests and mil.specs with some sample parts. The volume is very large and so the consideration of punching rather than what I am doing.

Thanks again

Good luck on the Cadmium coating...

milo

Hello Milo,

I take it from you comment that it is difficult or maybe unrealistic to Cadmium coat these spring washers. Can you enlighten me please.

Best Regards

Cadmium finishes have been banned by ELV, RoHS, REACH And WEEED directives in Europe and by most of the OEMS here in the states.

Look up End of Life Vehicles, Restriction of Hazardous substances, and Cadmium. Same with Hexavalent chromium coatings.

I have over 500 shops in my association I know of none providing CAd coatings for commercial (non military) work.

Gotta catch a plane.

milo