A local guitar tech I've done bits and pieces for in the past got in touch recently to see if I could make him a punch/die for knocking out small plastic parts (in ABS). I turned down the project (I know nothing about punches/dies and expected the tolerances to be very high to get anything that would stand a chance of working) and recommended that he post an RFQ up here, which he did. I got in touch with him after a few weeks to see how the tool came out - turns out that getting it made was going to be too expensive to justify for the relatively little use it would get. Being a hobbyist with nothing to lose but a weekend, I thought I'd have a go at it, here are the results:
I thought that a bar clamp would be enough to work the punch and it was for one of the plastics I tested it on, but I had to use a larger medium sized G-clamp to find enough force to punch through the ABS. Quite happy with how this came out - it is a bit of a faff to use and it's a bit sloppier than something you'd get made professionally, but hey - it's made and it'll hopefully get a bit of use. If I made another then I'd probably look into running a ball-nose inside the profile of the punch and 'hollowing' it out a bit so as to concentrate the cutting force along the edge of the punch as opposed to across its flat surface - makes sense and would almost certainly make the punching through a lot easier, but could have a detrimental effect on the finish. Any hints and tips..?
(EDIT: Plates were cut from 4mm 7075(T6) and the punch was cut from what I believe to be 2014)
Last edited by Wal; 02-05-2016 at 05:07 PM.
As usual Wal you always come up with an interesting project very nice...Clive
It's worth having a go, isn't it?! I reckon I'll be sitting down to re-design all of my axis based around profile-rail soon enough, could do with a bit of extra rigidity - will look at enlarging the x-axis travel too. Hopefully catch up with you soon!
Very nice, thanks for sharing :)
Awesome Wal - I know where to come to get a new truss rod cover for my Les Paul now :)
BTW - where do you get your 7075 from?
Last edited by Washout; 03-05-2016 at 08:31 AM.My CNC Projects: https://www.youtube.com/playlist?lis...7_1sygWRSIBh_a
>where do you get your 7075 from?
I've used metalweb a few times now - they have a depot not far from me. It's not cheap - IIRC I paid about £80 for 5 sheets of 200x500x4mm. Lovely stuff, though. Machines pretty well and has a Brinell Hardness rating of 150 (compared to 90-odd for 6082T6). Nice work on those guitar bodies, BTW - looking really good.
The Following User Says Thank You to Wal For This Useful Post:
;-)If you will not be swayed by logic or experience simply pick the idea you
like best, but ask yourself why you sought advice in the first place and,
for a simple life, perhaps consider not doing so in future
Nice Wal, always top notch the bits you do!Neil...
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