 |  | | | |  | |  |  | Machining question- no laughing! |  | |  |  | |
 Posted: Sun Jul 11, 2010 2:09 pm |
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| AirGunEric |
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| Joined: 20 Jan 2007 |
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Yup, I have virtually no useful machining skills!
Need to know how to machine a flat-bottomed hole in a rod.
By this I mean a hole like any other that would be created using a drillbit, but the bottom/floor of the hole needs to be flat, not concave as would be the case using a regular drillbit.
I have a small lathe (and minimal skills) but do not have whatever the appropriate tooling is for this; silly carbide- insert tips don't cut on the point, so I can't drill the hole and then flatten out the bottom using them it seems.
Any assistance would be appreciated! |
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| Posted: Sun Jul 11, 2010 2:33 pm |
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| ralphtonka |
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| Joined: 23 Oct 2008 |
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| use a mill end bit, avail @ princess auto or busy bee, can be used in a drill press or drill. |
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| Posted: Sun Jul 11, 2010 2:40 pm |
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| AirGunEric |
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| I'm probably wrong on this, but aren't milling bits meant to be used in a side-cutting manner, not in-line like a drillbit? |
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| Posted: Sun Jul 11, 2010 2:58 pm |
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| rsterne |
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Nope, mills work GREAT as a drill.... PROVIDED THEY ARE CENTER-CUTTING.... in fact you can (and should) use them that way to remove the majority of the material when cutting a slot and then just finish up by taking cuts on the side.... The cool thing about a mill is that it has a tendency to go straight into the work even when it is overlapping another hole.... ie with a 1/4" mill you can "drill" overlapping holes on 1/8" centers.... Minimal side cutting required to clean up after.... and that means fewer broken mills.... Just make sure you take shallow cuts the way you normally would.... don't just stick the mill into the ragged slot and wind it sideways.... or the mill will break for sure....
If you are trying to do a hole that is not a standard size for a mill (they come in 1/32" increments in the smaller sizes).... or a hole that is too deep for the mill you have.... you can also drill the hole to depth using a conventional drill and then grind a drill completely flat on the end to finish the job.... It will work much like a mill, being guided by the hole you have already drilled.... Make sure you drill the hole with the "pointed" drill to the proper depth to the center of the point.... Then when you go to cut the flat bottom with the flattened drill tip it only has to cut away the material on the edges of the hole.... It can't cut in the center because of the center part of the flute....
Bob |
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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal: Too many to count! |
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| Posted: Sun Jul 11, 2010 8:57 pm |
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| oddtodd |
| Silver Status Member |
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| Joined: 30 Dec 2008 |
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| Location: Richmond, IN USA |
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| Eric, I have a 3in1 and I only use regular drill bits for numbered or letter drills. everything else is millwork. |
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Airguns: Two starlings talking "Larry, did you hear that? Larry?? LARRY!!!!" |
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