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| making a hex head |
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| timeone:
Need some advice on making a hex head Ive got a round bar and need to cut a hex head ( eg make a bolt head ) ive got a milling machine and rotary table with a small chuck mounted, as i understand first i find centre the diameter of the bar is 14mm so im not sure what size hex i can cut. so whats the next step |
| mklotz:
The largest hex you can make is 12.124 mm AF. I would make it 12 mm implying a 1 mm DOC. |
| Jasonb:
Mount the R/T vertically on the mill table, put work in chuck and then rotate until table reads zero. Touch down with the rotating milling cutter and note the setting remove 1mm of material. Rotate table to 60deg and repeat, Rotate to 120,180,240 & 300. You should have a 12mm hex. You may want to remove a bit less and then check the AF distance then go round again with a finishing cut of half the difference. If its a bolt then turn the threaded part in the lateh first as its easier working on the end of a long round bar than trying to do it holding a small length of hex J |
| timeone:
perfect thanks guys ive just done a test and worked perfectly. can i do the same when making a nut my idea was to drill and tap a round bar first then put in the rotary table to do the hex then back in the lathe to part them off does this sound ok. Another question when holding bolts in a chuck how do you protect the thread from getting damaged |
| Troutsqueezer:
Screw the bolt into a nut and chuck that. |
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