Core hole - carry on or hammer action and bash through?

[benjiman]

Doing a core hole with diamond core bit, 52mm. Going through 8" of solid brick.

Been at it for an hour and only about 2 inches through.

At what point do you give up and put in a chisel bit and smash through? Do most trades just carry on until completion, or they call it off after a certain point?

 

[Harry Bloomfield]

Doing a core hole with diamond core bit, 52mm. Going through 8" of solid brick.

Been at it for an hour and only about 2 inches through.

At what point do you give up and put in a chisel bit and smash through? Do most trades just carry on until completion, or they call it off after a certain point?

Something not right there, are you using SDS?

 

[benjiman]

Something not right there, are you using SDS?

Using an sds makita, not set on hammer action, just normal drill setting. Its a brand new bit, erbaur.

 

[Old Salt]

What condition is the bit in now?

 

[benjiman]

What condition is the bit in now?

Still good, can see plenty of diamond on it.

 

[Old Salt]

Not sure how hard you are pushing but try going a little softer and slower, you are trying to find the sweet spot of speed, pressure and material.

 

[CBW]

Do most trades just carry on until completion

Yes, although, we normally don’t take as long. Heed advice of the others.

 

[Bluepeppo]

Did you pilot drill all way through first?

 

[Harry Bloomfield]

Did you pilot drill all way through first?

Have you snapped off the 2" core? Go too deep without breaking it and the core bit can bottom out on it.

 

[^woody^]

Have you snapped off the 2" core?

LOL. I wonder!

Been at it for an hour and only about 2 inches through

 

[kingandy2nd]

Bit is going to be knackered now.

I'd have mine on hammer action and clearing the waste out of the core every inch or so

 

[kingandy2nd]

Just re-read - you can see the diamond?! Are you using a tile drill bit?

 

[oldbutnotdead]

Your 'normal' drill prob isn't designed for coring (my old Atlas isn't)- you need to run at low revs otherwise the core bit overheats. Be v careful especially if you're up a ladder- if the bit jams in the hole and drill has no clutch you get a lot of torque trying to spin you round....
As above make sure the core bit isn't grounding on what you've already cleared, pull chunks out frequently, let drill and bit cool off every so often

 

[benjiman]

Have you snapped off the 2" core? Go too deep without breaking it and the core bit can bottom out on it.

Yup 2 inch core is out.

 

[benjiman]

Did you pilot drill all way through first?

No..is that good practice?