SDS & hole saws

[Selfmade]

You big ----- !!!

Please don't! I'm not even pretending to be female!

 

[Geordie Spark]

Like. (Like button gone walkabouts.)

That happens with me as well. I need to press F5 to refresh the page to make the button reappear.

I have to use that F5 so much on this forum that the lettering has almost worn off it!!!

 

[Selfmade]

Related question - I owe you guys a lot! Do you cool an SDS bit with water when in use? I quickly took to doing that with ordinary masonry bits after bending and 'untwisting' a few! Might help with the dust in motor issue as well...

 

[shanky887614]

That happens with me as well. I need to press F5 to refresh the page to make the button reappear.

I have to use that F5 so much on this forum that the lettering has almost worn off it!!!

Ctrl+r does it as well

Dont press alt+f4

 

[Geordie Spark]

Related question - I owe you guys a lot! Do you cool an SDS bit with water when in use? I quickly took to doing that with ordinary masonry bits after bending and 'untwisting' a few! Might help with the dust in motor issue as well...

I never did. I think you could make the overheating problem worse by turning the concrete / brick dust into mud which would clog the flutes of the drill.

If yo have to cool it I would suggest a steady blast of compressed air, but then you're getting into problems of where to get it from and the dust that will be flying around.

Your problem with "ordinary masonry drills" is one of speed - you were running it too damned fast! Slow it down a bit and let the drill bit do the work in its own time.

If you want to be a real clever shyte, you can calculate how fast you should be running the drill bit at from the formula N= 12xS / Pi x d

where: N= spindle speed in RPM (this is the bit you're trying to find out)
12 is a constant (cos this formula uses imperial units)
S is the cutting speed of the material (brick or whatever) in feet per minute
Pi is 3.14
d is the diameter (in inches) of the drill.

There is a metric variation on this but I could never be arsed to learn it.

 

[HandySparks]

Use a plastic carrier bag to stop this.

Or one of these:
Holesaw - Dust and Debris Eliminator

Well worth the price.

 

[Geordie Spark]

Or one of these:
Holesaw - Dust and Debris Eliminator

Well worth the price.

I agree.

It's better than the plastic bag because it catches the dust. The plastic bag does not - it only stops it from getting sucked into the machine, but it can be useful for more applications than drilling holes for downlights.

If I were fitting downlights I think I would but one of these gadgets.

 

[Selfmade]

I never did. I think you could make the overheating problem worse by turning the concrete / brick dust into mud which would clog the flutes of the drill.

If yo have to cool it I would suggest a steady blast of compressed air, but then you're getting into problems of where to get it from and the dust that will be flying around.

Your problem with "ordinary masonry drills" is one of speed - you were running it too damned fast! Slow it down a bit and let the drill bit do the work in its own time.

If you want to be a real clever shyte, you can calculate how fast you should be running the drill bit at from the formula N= 12xS / Pi x d

where: N= spindle speed in RPM (this is the bit you're trying to find out)
12 is a constant (cos this formula uses imperial units)
S is the cutting speed of the material (brick or whatever) in feet per minute
Pi is 3.14
d is the diameter (in inches) of the drill.

There is a metric variation on this but I could never be arsed to learn it.

Thanks, I might just try that formula! Certainly low gear full power (600RPM no load) on my combi does nothing on concrete - it just rattles around on the surface. So maybe something in between...

 

[Selfmade]

Or one of these:
Holesaw - Dust and Debris Eliminator

Well worth the price.

Interesting, thanks. I can't help thinking some kind of plastic tub like a yogurt pot only flatter could do the job though...

 

[Selfmade]

I'm off to bed now, thanks so much for all the help and advice! Really makes a difference!