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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Stupid questions about parallels
On Mon, 7 Mar 2011 12:31:40 -0700, "Bob La Londe"
wrote: When you set something in your vise with parallels do you slide them out before beginning work, or do you press down firmly enough on your work pieces that they won't move easily as the machine accelerates and decelerates? I seem to get more accurate work piece positioning if I press down gently while tightening the vise, but at that light downward force the parallels can slide out after I have the work piece clamped in. Seems if you leave them in they could shift on their own or worse slide out and fall between the table and the column, but if you slide them out eventually you will wear them out of tolerance from the friction of removing them. Not really an issue for a 2 minute job, but I rarely do a 2 minute job. Heck, I rarely do 2 hour job. Hey Bob, As others have said, tapping with a soft face hammer as you tighten the vise really helps. Another good aid is just put some paper between the work and the parallels. Take care. Brian Lawson, Bothwell, Ontario. |
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