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MS, USA
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Posted: 1/16/2021 5:00:33 PM EST
[Last Edit: 1/16/2021 5:02:21 PM EST by GrimEReaper]
What type of drill bit is best to use? And what technique? I made a standard front sight post for an AR22 into a "clamp" on. Drilling and threading holes in the bottom front and back and the traditional pin spots. So I would like to dimple for the two bottom set screws.
Also do I start with small diameter bits and work up. Set screws are #8 |
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Posted: 1/16/2021 5:06:00 PM EST
Get an SLR Dimple jig and a Bosch Cobalt drill bit.
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Posted: 1/16/2021 6:58:53 PM EST
knock the finish off with the touch of the tip of a dremel tool abrasive and then drill after nitride layer broken through.
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MS, USA
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Posted: 1/16/2021 7:22:23 PM EST
Quote History Originally Posted By reelserious: knock the finish off with the touch of the tip of a dremel tool abrasive and then drill after nitride layer broken through. Great idea. |
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Posted: 1/16/2021 8:00:21 PM EST
also making a little flat spot before drilling helps a lot. much easier drilling on a flat surface as opposed to a round one.
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Posted: 1/17/2021 12:34:20 PM EST
HSS will work just fine if you use a vise and drill press.
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GA, USA
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Posted: 1/17/2021 12:39:12 PM EST
Quote History Originally Posted By SouthernGunHand: Get an SLR Dimple jig and a Bosch Cobalt drill bit. Add to the above a transfer punch. |
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Posted: 1/17/2021 12:59:45 PM EST
Quote History Originally Posted By OTDR: Add to the above a transfer punch. |
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Posted: 1/17/2021 2:05:54 PM EST
[Last Edit: 1/17/2021 2:06:22 PM EST by ahrion]
Quote HistoryOriginally Posted By OTDR: Add to the above a transfer punch. Never used a transfer punch. I just got the cobalt 5-32 bit with the SLR dimple jig. I'm assuming I need to simply use the SLR jig, center the gas hole, put the dimple screw in and just tap a 5/32 transfer punch with a rubber mallet, and then finish the rest off with the bit? To my understanding, transfer punches simply help the alignment of the bit? Any recommendations on transfer punches? |
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Posted: 1/17/2021 2:21:33 PM EST
[Last Edit: 1/17/2021 2:26:33 PM EST by SouthernGunHand]
Quote HistoryOriginally Posted By ahrion: Never used a transfer punch. I just got the cobalt 5-32 bit with the SLR dimple jig. I'm assuming I need to simply use the SLR jig, center the gas hole, put the dimple screw in and just tap a 5/32 transfer punch with a rubber mallet, and then finish the rest off with the bit? To my understanding, transfer punches simply help the alignment of the bit? Any recommendations on transfer punches? Correct, it just creates a divot to center your bit and so the drill bit doesn't jump. Just use a regular hammer to tap. Stay level/straight with the Jig and drill slow and keep an eye on the depth and you'll be fine. |
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Posted: 1/17/2021 5:57:25 PM EST
Quote History Originally Posted By SouthernGunHand: I have this transfer punch --> https://smile.amazon.com/gp/product/B07H2NSBWW/ref=ppx_yo_dt_b_search_asin_image?ie=UTF8&psc=1 Correct, it just creates a divot to center your bit and so the drill bit doesn't jump. Just use a regular hammer to tap. Stay level/straight with the Jig and drill slow and keep an eye on the depth and you'll be fine. That one isn't circular. Does that matter? |
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Posted: 1/17/2021 6:25:47 PM EST
[Last Edit: 1/17/2021 6:32:43 PM EST by SouthernGunHand]
Quote HistoryOriginally Posted By ahrion: That one isn't circular. Does that matter? |
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MS, USA
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Posted: 1/30/2021 9:53:07 PM EST
What I did was make my front sight base a clamp on for a blowback .22. I tapped it for two set screws from the bottom plus two on each side where it traditionally is drilled for pinning. I got the 1/8 transfer punch and took one bottom set screw out and punched it, then put set screw back and punched the other bottom location. I made sure they were marked good. Then put the barrel in a padded vise and slowly started a hole with a cobalt 3/32 bit which did not seem to hardly get anywhere. It did give me enough to start the 5/32 cobalt bit and get a good dimple. The 1/8 transfer punch from ebay helped me make sure the punch was centered inside the tapped hole at the bottom of the FSB. Thanks for that suggestion!
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MS, USA
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Posted: 1/30/2021 9:55:22 PM EST
[Last Edit: 1/30/2021 9:56:23 PM EST by GrimEReaper]
Double tap
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