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Old 05-07-2020, 06:40 AM
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Default Drill tap combination

I have been thinking that a combination drill tap would work well for a job I do fairly regularly, on ebay I see them sold in sets up to 10mm quite cheap but 12mm the price skyrockets, is there a reason for this?
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Old 05-07-2020, 08:39 AM
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I too have been curious about those. I just cannot imagine having drill cuttings mixed in with tap cuttings being a good thing. Please let us know if you get any and how they work for you.
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Old 05-07-2020, 04:05 PM
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They work well for thinner metal but things can get interesting in thicker plate if the tap pitch is greater than the drill cutting depth per revolution.
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Old 05-07-2020, 04:13 PM
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I have a cheap set and they work ok. Make quick work of thin material. Broke the 10-24 a few months ago and bought a Milwaukee from HD to replace it. (Pricy)but it Worked great in the 1/8” aluminum I was tapping the other day.

Klein sells a set #6 - 1/4” and it says “for up to 10ga. Material “
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Old 05-07-2020, 06:18 PM
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The originator is IIRC from Genesee New York, and call it the "DRAP".
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Old 05-07-2020, 06:20 PM
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Most of my tapping is from 1/4" to 1" material so sounds like they will not work that well for me. Thanks all for the inputs.
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Old 05-07-2020, 06:20 PM
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I used them in a production environment about 20 years ago on 1/4 aluminum parts. Worked great for that. Otherwise I have no experience outside of that. I couldn't tell you why the price jumps.

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Old 05-07-2020, 06:42 PM
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I have some and have used them quite a bit, I guess under the right circumstance they might work fine, I found the drill speed needed to drill the metal without issues was way too fast to tap, the tap would grab, then snap. I gave up on them. My use was on 1/4” and 3/8” steel plate and angle, I never used them on aluminum.
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Old 05-07-2020, 07:37 PM
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I use the Greenlee ones on a daily basis, mostly the 10/32" for ground screws and grounding bus installation. They work great on electrical enclosures and fixture boxes although the 6/32" will be the first to break when you look at it wrong. Never broke a 10/32" but have worn out dozens of them over the years. Broke 2 1/4X20s in 1/4" plate. Another guy told me they work great in an impact driver and he was right, I always use the impact driver with them now.
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Old 05-08-2020, 06:54 AM
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I see they have moved out of NY...I can't blame them:
http://www.dreamertool.com/contact.html
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