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Old 06-14-2013, 05:37 PM   #1
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masonry drill speed?


I need to drill some 1/4 and 7/8" holes in 4in concrete blocks using a36v hammer drill. I have a cheap 1/4 bit and an expensive 7/8.

What speeds are best?

I drilled a 7/8 first and was surprised a how easy it was on slow. I then did a 1/4 and it wouldn,t drill at all. I incrased the speed and it improved dramatically. I don't know how good it was for the bit, but I did the other 5 holes on high. Was that right?

I have 6 7/8 to drill. What speed do I use?

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Old 06-14-2013, 06:02 PM   #2
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masonry drill speed?


Most good rotary hammers (i.e. not the ones that are on standard drills) are low speed rotationally and good on the vertical hammer action.

If you go too fast on the common 3 and 1 drills, the hammer is more like noise than a true deliverable of force.

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Old 06-14-2013, 07:57 PM   #3
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masonry drill speed?


You don't want to run the bits at any fast speed- they'll get hot very fast and that's the end of them, slow and steady is the best speed.
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Old 06-14-2013, 08:01 PM   #4
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masonry drill speed?


Keep them wet..... I usually just take a plastic milk bottle... punch a hole in the bottom.... and let it "pee" on the bit

Seems different substances like different drill speeds.... I guess that my Boshe Bulldog and most all drills are variable speed.
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