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Author Topic: What happened to my masonry drill bit?  (Read 726 times)

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Offline Kilgore

  • Posts: 4
What happened to my masonry drill bit?
« on: April 06, 2021, 05:23 AM »
I can admit this is a user end error, but I'm curious if it happens more often.

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Offline forestmount

  • Posts: 19
Re: What happened to my masonry drill bit?
« Reply #1 on: April 06, 2021, 05:31 AM »
It looks like the tip might have jammed and the shaft twisted. Was the drill in hammer mode?


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Offline mino

  • Posts: 337
Re: What happened to my masonry drill bit?
« Reply #2 on: April 06, 2021, 06:08 AM »
Not letting the bit cool-down between holes combined with the bit being stuck combined with drilling at too-low sped thus too-high torque. Typical problem with cordless impact drills as they have a too-high torque at the lower speed setting.

When drilling to masonry with PDC, use speed 3 or 4 (low torque) and let the bit cool down between holes. If you want to drill at lower speed, still use speed 4 and regulate the drilling speed by the trigger.

Ref heat, when drilling masonry I have a cup of water around and cool the bit after every hole by a short drop in water. When on a ladder, I would just put a bit of spit on it by finger, just to get it the <100C before the next hole.

Do not however cool-down a bit that is too hot - after several holes it can be easily 500C and fast-cooling by water can damage it even more. If you are cooling down by water, you need to do it after every hole so the bit is not too-hot to be damaged by the rapid cooling.
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Offline Frank-Jan

  • Posts: 1173
  • Dutch Canadian living in Belgium
Re: What happened to my masonry drill bit?
« Reply #3 on: April 06, 2021, 01:00 PM »
Never had the twisting happen, I have experienced the widia tip comming off.

Offline Mike Goetzke

  • Posts: 727
Re: What happened to my masonry drill bit?
« Reply #4 on: April 06, 2021, 01:07 PM »
That's a special bit for getting close to the wall without your drill getting in the way.

(Sorry for the humor but it reminded me of a cartoon I saw years ago about several useful drill bit variations.)

Offline Blues

  • Posts: 109
Re: What happened to my masonry drill bit?
« Reply #5 on: April 06, 2021, 02:10 PM »
That's a special bit for getting close to the wall without your drill getting in the way.

(Sorry for the humor but it reminded me of a cartoon I saw years ago about several useful drill bit variations.)
[big grin] [big grin] [big grin] [tongue] [tongue]

Offline rst

  • Posts: 2574
Re: What happened to my masonry drill bit?
« Reply #6 on: April 06, 2021, 07:37 PM »
They are for going around electric and plumbing lines to avoid welding and showers.

Offline Kilgore

  • Posts: 4
Re: What happened to my masonry drill bit?
« Reply #7 on: April 11, 2021, 06:30 AM »
Haha, you guys kill me  ;D
It was actually pdc in hammer mode, speed setting 2, close to the wall so I angled it a bit and more like concrete then masonary. You should use the right tool for the job, but sometimes the tool you have is what is ‘right’. The BHC is on my wish list...
But I learned some new things: decrease torque, control speed with trigger and let the bit cool.
Thanks!