Rule of thumb for minimum inner radius?

[prismshian]

I'm modelling putters and lately I've had my prototypers 'modify' my work, which wasn't very nice! lol.


What's the minimum inner radius of a corner of square hole for example? Would it be fair to make the inner radius of the corners 0.1mm?


There's this particular part in the cavity which I want almost sharp and squared.


Could use some advice as to what a general rule of thumb for minimum inner radius as far as modelling is concerned.
Sincere thanks!



Edited by: prismshian

 

[solidmonkey]

Hi again,


This will depend on how it is manufactured. You are best talking to your toolmakers at the outset and finding whatthey can do. Bear in mid that one might have different skills and tools from another, so find one you can trust and talk to them a lot. The only real rule of thumb is: anything can be made - for a price!

 

[prismshian]

Hey there,


That makes sense, 'anything can be made for a price' lol. Sounds right.


Thanks for the tip regarding talking more with them before you start any projects to see if they can pull it off.


Cheers

 

[joelewinski]

Inside corners will NEVER be sharp, unless of course the part is made with multiple pieces joined together to FORM a sharp. As far as a MINIMUM radius, well THAT depends on how the cut-out or hole is machined. For example, a verticle mill could probably go down as far as R.031, but it wouldn't be very deep. A wire E.D.M. machine could go down to maybe R.003 or R.004 BUT, this would have to be a through hole, not a blind pocket unless again, if it were made with two pieces. It really depends on the process used.


Do you really NEED a sharp corner on a putter? Generally speaking, sharp corners are a no-no. A sharp corner is where stress-fractures waiting to happen, hang out. Not the best design practice.


What exactly are you trying to achieve? Maybe we could offer-up more help.

Joe L.