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Stainless Hinge

mike newall

Well Known Member
Sponsor
Doing the heater flap.

Match drilled, dimpled, found the stainless rivets......

Now - countersink the stainless hinge - Hmmmmm.

Any tips for that ? Normal countersink ? what speed ?

Thanks
 
I just carried on as per normal instructions as if it was aluminium. I didn’t even think about it. I always use a lubricant like Boelube with anything steel though. Same with the rivets. They squeezed just like aluminium. For my setup, and I stress for my setup, I have found that the slowest speed on my drill press 335 rpm and quite a high feed rate reduce the chances of chattering when machine countersinking.
 
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The more flutes the more chatter, too much engagement. If you are using a drill press (as you should be with steel) run slow and use the single flute (round hole through the counter sink) and you will get a very nice result. If you use the four flute countersinks with a drill press and lock everything down tight you will be OK. If you try to free hand a four flute you will never get good results.
 
Tried a test on a spare piece of hinge - used the single hole countersink cutter at 500rpm with general purpose cutting fluid and a reasonable amount of pressure.

All went extremely well, the countersinks cut well, just eyeballed the depth as the cutter wasn't in a cage.

Numatx riveter needed a little extra pressure but set the stainless rivets beautifully.

Thanks for the input chaps.
 
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