![]() The number of bits that I've burnt up on that DeWalt drill are enormous. I know the OP only has a 20 V battery Dewalt and I know that he said that that's what he has so don't talk about it, but from my experience in construction that's exactly what the problem is. I think the rotations per minute (rpm) are much too low or perhaps the impact that the motor provides it's not forceful enough. The Dewalt bits always burn up if you try to use them on real rock. I only use the DeWalt on stucco on houses and hardly ever on real stone. I've been working in construction for 15 years and I use a DeWalt Hammer drill and a Bosch hammer drill and a Hilty hammer drill and there is a gigantic difference between the three. I'm surprised nobody's talking about the fact that he's using a DeWalt drill. Otherwise the dust sits down in the hole and interferes, even leading to an oversized hole and a spinning bolt. I've found steep rock self cleans with the flutes of the bit, but shallow rock requires cleaning while drilling (I just keep pulling the drill out). A larger more powerful drill with more mass seems to help greatly. I think the key is for that SDS bit to really slam back and forth to create the hammering motion. This is all in hard granite.īasically, the little lightweight drills spin more than hammer. I did 15 holes with the same bit, each hole took about 20 seconds! A world of difference. Same bit, which we thought we may have ruined and burned up. Later I put some bolts in on a sport climb on rap, so I used a big heavy Makita. This is 10mm (basically 3/8) Hilti (Petzl) bit. It sucked and took 3-4 minutes per hole (long time while crimping holds) and it blued the end of the drill. We recently put up a route ground-up, so we used the lightweight M12. ![]() Could be your 20V dewalt is like my 12V M12 Milwaukee. I'm having a tough time believing that a Hilti or Bosch would make that much difference, especially if they're hitting even harder and about same RPM.ĭefinitely hammer drill dependent. I don't want to order replacements until better idea what I'm doing wrong.ĭoes anyone pull the bit and quench their tip with water every inch? Try and flood the hole with water? Would it make such a huge difference that a bit which (according to one site) should last 350 holes in concrete won't even last 2? I feel like it's the amount of force I'd use to drill a hole in say, aluminum w/ a regular sharp bit. I'm pulling tip out to clean chips regularly ~ every inch or so.Ībout 10lbs of force? My friend thinks I'm leaning on it too hard, I didn't think so initially, now, not sure. (I triple checked all this after smoking first bit) ![]() I can lick my fingers and sizzle the tip even after short bursts.ĭefinitely set to turning and hammering mode (same as in pic in link)ĭefinitely set to correct direction. Tip is mushed.Īfter first hole, the steel under the carbide tip is starting to turn blue. I've got a 20V cordless dewalt dch273b SDS rotor hammer (don't judge, it's what I've got).Īlso used friend's other bit, not sure brand, but it was new.ĭrills quickly first couple inches, then eventually just stops and won't drill anymore. I believe I'm drilling into quartz granite. You can measure 1/16″ to 1/2″ range of drill bits using that gauge.New 3/8" SDS Plus bit doesn't last 2 holes. As for me I use this gauge to quickly identify the drill bit size in inches and millimeters. The below table will introduce you to the fractions and decimals of the inches with mm. So we have to interchange the metric units and imperial units. Inches are really popular in the USA but, beyond that, mostly used SI units. You can multiply by 25.4 of inches value when you convert that to mm.Įx – 0.5 inches = 1/2″ = 0.5 inches × 25.4 = 12.7mm When you measure drill bit size in inches, you can convert it into mm using this method. Hence measure it as much as possible accuracy. Practically, you may not be able to measure the drill bit diameter more than 2 decimal places. ![]() You can check fraction and decimal conversion using the below table. ![]() When drill bit diameter size is available in mm it can convert into inches easily. Fractionĭrill Bit Sizes in inches and mm table Drill Bit Size Conversion Methods 1. You can see fractions, inches, and mm values for each drill bit size here. How to Convert Drill Bit Inches to mm?īy following the above method, this table has been prepared with available drill bit sizes. ![]()
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