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Is there any company out there that you can send spot weld bits to to be reground? I know there are machine available but they cost in excess of €1000. I tend to go through 20+ bits a year and they're not cheap so rather than constantly dumping them I'd like to see about getting them sharpened. Thanks in advance
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Have you tried local engineering firms? They will usually have a grinder set for honing multi flute milling tools.
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steveg
Posted a lot
Posts: 1,565
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Forgive my ignorance but the only spot welding related bits I have seen are copper or do you mean the actual sharpening tool itself or do professional use welders different sorts of electrodes/arms ?
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Hi, He means the drill bits to drill out round the top layer of the spot welds, separating the two layers with out too much damage. They have a flatter profile compared to the 120 degrees of a conventional drill.
Colin
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Last Edit: Nov 7, 2017 23:53:44 GMT by colnerov
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steveg
Posted a lot
Posts: 1,565
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Oh, my only excuse is that it's a bit late I didn't even think of that !
I spent many unhappy hours sharpening drills by hand as an apprentice. You might be able to do them like that but it won't be a quick few minutes job if they are the sort with the small point in the centre.
You can get attachments for bench grinders you might be able to adapt but even the proper drill grinders might not be easy to set up. I've only used them for standard drills.
Found this
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Last Edit: Nov 8, 2017 0:50:42 GMT by steveg
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I use spot weld drills all the time in my small restoration business - thing is to purchase good quality ones in the first place - disregard any spot weld drill that is not cobalt - although you will pay more for the drill bit they last significantly longer - has for sharpening them - well, used correctly on a slower speed so that you don't burn or overheat the tip / cutting edges I can obtain a decent life out them - they are so awkward to re-sharpen that I don't bother has I have certainly had my value out of them by the time they are blunt - yes it would be nice if you could re-sharpen them but time is money etc - this is who supplies my 6mm / 8mm cobalt bits if you are looking for a source: www.lb-restoration.co.uk/cgi-bin/store/commerce.cgi?cart_id=1510130969.32032&product=RESTORATION&pid=464 |
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Last Edit: Nov 8, 2017 9:03:27 GMT by Deleted
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Might help using a cutting compound on them if it not going to be difficult to remove traces of it prior to re welding . II have used this for 20 years , great stuff CT90 cutting compound , you can get it as a grease which i prefer as its less messy or a oil One can will last years www.amazon.co.uk/CT-90-Cutting-Tapping-drip-compound/dp/B005EF7W0C |
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Have you had a look through the thread on "Making Panels" ( forum.retro-rides.org/thread/70135/panels ) in this board? I remember TonyBMW put a few photos in there showing how to sharpen them using a bench grinder, and the same technique could be used to take a standard 6mm or 8mm drill bit and make it into a spot-weld drill. |
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slater
Club Retro Rides Member
Posts: 6,390
Club RR Member Number: 78
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Sharpening spot weld bitsslater
@slater
Club Retro Rides Member 78
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Anyone with a cutter sharpener can do them in seconds. You can do them fairly easily on an offhand grinder tho. Its not like they are precision. Helps if you have a well dressed fine wheel to get into the corner of the 'pip'but it doesn't really matter if the are a bit rough.
Also you can make them out of normal drills easily. Don't waste your money on crazy stuff.
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There is guy that advertises occasionally on homeworkshop that sharpens slot drill, £8 to do 5. . Sure he could do them for you. All proceeds of his sharpening goes to a Children's hospice,in fact you make the cheque out to them. If you are interested,I will dig out his contact details. A worthy cause and he charges a pittance...
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Last Edit: Nov 8, 2017 13:32:51 GMT by Deleted
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There is guy that advertises occasionally on homeworkshop that sharpens slot drill, £8 to do 5. . Sure he could do them for you. All proceeds of his sharpening goes to a Children's hospice,in fact you make the cheque out to them. If you are interested,I will dig out his contact details. A worthy cause and he charges a pittance... Nice to know there are still some good guys left . |
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