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| Cutting a long slot. |
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| NeoTech:
So i need to cut a long slot, about 20cm long, and about 40mm deep, and about 6mm wide.. So tried this with a mill.. that did end in thee broken mills. I dont have a side-milling cutter for doing this, not in 68 diameter, 6mm wide and with a 22mm center hole anyway.. So im thinking, can this be done on a shaper? the slot is not going all the way trough, so it will stop "dead" in the end of the slot.. but its open in one end. (its for a integral knife frame) |
| PeterE:
Just a thought, but why not start the slot by chain drilling? That way the need for milling is very much limited to the final finish which also should spare the milling cutter quite much. The depth will not be a problem either. /Peter |
| Jonny:
Assume this is in steel? Do these things about twice a week but usually 8 to 10.2mm slots up to 48mm deep. Keep an eye and ear open for any change of note, things can happen quick. For 6mm I would start off with a 5mm as far as it can go then change over to a 6mm, it will give a better finish and avoid the torqueing off. Constantly clear out debris and look at the cutter often , see if its deflecting and all should be fine with coolant. There wont be many 40mm flute x 6 dia cutters available, don't skimp carbide of reputable brand. No advice on shaper but will have to constantly clear out the slot same as above. Air line. |
| Manxmodder:
If using a shaper the stop point needs a hole driling so the tool has somewhere to break the chip into. If not then the swarf starts to impact and pack at the termination point of the cut. Also what Jonny said,the cut needs frequent clearing of swarf and some cutting fluid should used. Another option would be to use a slitting saw indexed across several passes to bring the slot to finished width. ...OZ. |
| trapper:
Yes agree with everbody.The ideal way clamp it to table stub arbor in the nose of machine a mill where you could take head off and work off column,use a "chipping saw"or "stagger tooth"saw bobs your uncle,The shaper method would work like has been said you want a hole to run your tool into at end of stroke to stop a build up,the depth your going to with such a small diameter tool is unsuitable for a shanked tool will snap- |
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