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Can anyone machine 2mm stainless steel plate for a small project?
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langwadt:

--- Quote from: Gregg on November 12, 2019, 11:15:41 pm ---Bi-metal toothed hole saws would work if you have a means of turning them slowly.  Stainless doesn’t like too high of a cut rate and gets hot very fast; cutting fluid is highly advised.
Alternately, a hole saw for the inner circle and a variable speed hand-held jig saw for the outer would work.  I like stick wax formulated for metal cutting on things like jig saw blades and stainless formulated tapping fluid would be perfect for the hole saw.
I can make it if I have the material, but the shipping probably won’t be worth the cost.  What is the maximum thickness you want and will 304 stainless work, or does it have to be 316?

--- End quote ---

the trick to drilling/cutting stainless is going slow and using lots of tool pressure, you want to be cutting not rubbing because rubbing work hardens it

stainless cuts like butter with a thin cut off wheel in an angle grinder
Gregg:
I have one of these https://www.milwaukeetool.com/Products/Power-Tools/Drilling/Magnetic-Drills/4208-1 that is perfect for large hole saws; it can go as slow as 15 RPM with adequate torque because of the feedback speed control.  I have drilled lots of 5 inch holes through 1/2 inch thick steel using bi-metal hole saws and tapping fluid.  I also have a nice chunk of thick I beam to set it on and clamp non-magnetic work sufficiently.  I've found the secret to cutting stainless and other hard materials is reasonably slow speed and make sure chips are forming with smooth feed pressure; cutting tools work better when they are actually cutting away virgin material and not riding along just producing friction. 
soldar:
Cut off a (very) short length of 40 mm stainless pipe so you have a ring now. Weld half rings to the sides.

Again, I cannot see how doing this abroad is going to be any cheaper or easier than doing it locally.
TassiloH:
Just out of curiosity I just made a sketch and got the pricing from my go-to laser cutting service:

Made from 5mm thick stainless steel, that would cost around 10 EUR (about 11US$) without de-burring of the cut edges depending on lead time here (plus shipping/packing 10 EUR and tax on everything 4 EUR, so about 20 to 25 EUR delivered here, single pieces are a pain...). So it is not totally unresonable to make such a disk compared to other off-the-shelf solutions.

Look around - there must be a similar service near you. If it helps, I have attached the file (80mm outside, 39.6mm inside, 8 holes 10mm diameter, 5mm thick).


soldar:

--- Quote from: TassiloH on November 13, 2019, 12:11:43 pm ---Just out of curiosity I just made a sketch and got the pricing from my go-to laser cutting service:

Made from 5mm thick stainless steel, that would cost around 10 EUR (about 11US$) without de-burring of the cut edges depending on lead time here (plus shipping/packing 10 EUR and tax on everything 4 EUR, so about 20 to 25 EUR delivered here, single pieces are a pain...). So it is not totally unresonable to make such a disk compared to other off-the-shelf solutions.

Look around - there must be a similar service near you. If it helps, I have attached the file (80mm outside, 39.6mm inside, 8 holes 10mm diameter, 5mm thick).
--- End quote ---

Wow, that is a really good price for the part. I cannot imagine getting it for that price in Spain. I don't think I could get the raw material for that price, much less the machining. Maybe the postage would be comparable.
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