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| The Birth of a Grub Screw |
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| awemawson:
Only a mini project this one! For some time I've needed a 5/8" x2" BSF socket grub screw in HT steel to complete my Edwards Box & Pan Folder rebuild project: http://madmodder.net/index.php/topic,8981.0.html For some reason they seem now to be extinct - shorter ones no problem but this needed the full length to make the necessary adjustments so I needed to make one - very simple except for the hex socket. Now I can EDM funny shaped holes were it not for the fact that my Eurospark diesinking EDM machine had a leaky set of bellows so was out of commission - so first repair the EDM machine: http://madmodder.net/index.php/topic,9319.0.html OK EDM now up and running so all systems GO :ddb: So what do we want - well one of these but without the cracked hex hole :bang: |
| awemawson:
So now we need to make a male electrode. Simple milling job using a 5C collet holder with a hexagonal body. Needs a central hole, as diesinking is best done with copious flushing, and this lets me flush through the electrode. It's also useful for alignment when setting up. |
| awemawson:
Now what to make it from - needs to be a tough high tensile steel. All I had to hand was a rather rough bit of 5/8 re-bar until I hit on a 2" x 5/8 BSF HT bolt on eBay - so that's what I used. |
| BillTodd:
I have machined the head of a CS cap screw to make a grub in the past. Will be watching with interest:) Bill |
| awemawson:
So the bolt needs decapitating, and a central hole counterdrilling, as if you don't do this the electrode flushing hole will leave a pillar in the socket like a security fitting. Note that I use thick brass shim round the threads to save them from the chuck jaws |
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