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 Post subject: Sds drill bits
PostPosted: Tue Dec 11, 2018 12:51 pm 
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Is it me or are the quality of drill bits getting worse
I use 7mm bits a lot in my job some days as many as 200 holes drilled ,my resent purchase was bosch only lasted a couple of weeks,prior to that i bought dewalt whilst slightly better than the bosch again not by much
Any recommendations for a good long lasting bit

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 Post subject: Re: Sds drill bits
PostPosted: Tue Dec 11, 2018 1:02 pm 
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I think heat generated in continued hard drilling buggers them quicker.

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 Post subject: Re: Sds drill bits
PostPosted: Tue Dec 11, 2018 5:21 pm 
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hilti bits are decent.

strangely enough erbauer seem to be canny to me also



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 Post subject: Re: Sds drill bits
PostPosted: Tue Dec 11, 2018 5:25 pm 
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Been reasonably happy with the Heller Trijets I've had in 5.5 and 7mm - the main problem is that Toolstation has stopped selling them and gone over to Milwaukee. Not sure I trust them.

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 Post subject: Re: Sds drill bits
PostPosted: Tue Dec 11, 2018 10:18 pm 
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Doesnt sound bad really if its in decent concrete... just buy more bits. Theyre consumables at the end of the day.


Did a job back along helping some German contractors, theyd drill about a dozen 18mm holes then break out a new bit, because it started to become inefficent. Had a supply of slightly used 18mm bits for quite a while after :lol:

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 Post subject: Re: Sds drill bits
PostPosted: Wed Dec 12, 2018 7:58 am 
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Funnily enough the Bosch bit I bought is crooked. I prefer my aldi cheapies but then I don't drill an awful lot of holes.

200 holes is pretty good going I would say. I guess the thing to do would be to buy a couple of different brands and see hoe many holes per bit you, divide it by cost and go from there. You might find the expensive bits last longer but the cost per hole may work out more expensive.


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 Post subject: Re: Sds drill bits
PostPosted: Wed Dec 12, 2018 9:12 am 
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Does everyone just dump their bits once they go dull? No one actually sharpens them ? I only ask because I touch up mine and get much longer life out of them. On one job some fitters were using 12mm bits and just chucking them and I picked them up , sharpened them and had more than I could ever use, think I sold them in the end. Just for the record most of mine are dewalt or Bosch .


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 Post subject: Re: Sds drill bits
PostPosted: Wed Dec 12, 2018 9:51 am 
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I use the 6mm SDS bits daily when drilling into the road. I bought around twenty cheap ones from Screwfix about a month ago when they were on clearance (can't recall the name) and I have two left!

I've tried them all and think the Bosch, Hilti, Dewalt are all much of a muchness. The Hilti ones are really hard to find around my way.


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 Post subject: Re: Sds drill bits
PostPosted: Wed Dec 12, 2018 10:15 am 
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Grendel wrote:
Does everyone just dump their bits once they go dull? No one actually sharpens them ? I only ask because I touch up mine and get much longer life out of them. On one job some fitters were using 12mm bits and just chucking them and I picked them up , sharpened them and had more than I could ever use, think I sold them in the end. Just for the record most of mine are dewalt or Bosch .


I sharpen pretty much all my drill bits but I don't imagine full timers have the time or tools to do that.


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 Post subject: Re: Sds drill bits
PostPosted: Wed Dec 12, 2018 11:12 am 
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Grendel wrote:
Does everyone just dump their bits once they go dull? No one actually sharpens them ? I only ask because I touch up mine and get much longer life out of them.

Rorschach wrote:
I sharpen pretty much all my drill bits but I don't imagine full timers have the time or tools to do that.

No we don't. In any case the firm often issue them FoC, so I for one buy very few 5.5 or 7mm drill biits myself, only for the odd private job.....

Hitch wrote:
Doesnt sound bad really if its in decent concrete... just buy more bits. Theyre consumables at the end of the day.

And there's the rub - in dense concrete I reckon that at 30 or so holes most bits have had it (the cheap ones won't get half that distance, the Hilti ones do better, but even they give out eventually and at the price they are I don't see them being any cheaper per hole). In softer brick, sandstone, blockwork, etc you'll easily top 100 holes

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 Post subject: Re: Sds drill bits
PostPosted: Wed Dec 12, 2018 11:41 am 
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Job and Knock wrote:
Grendel wrote:
Does everyone just dump their bits once they go dull? No one actually sharpens them ? I only ask because I touch up mine and get much longer life out of them.

Rorschach wrote:
I sharpen pretty much all my drill bits but I don't imagine full timers have the time or tools to do that.

No we don't. In any case the firm often issue them FoC, so I for one buy very few 5.5 or 7mm drill biits myself, only for the odd private job.....



Even when I was working for a firm that provided bits free several of us would still sharpen bits. Next to the masons shop they provided grinders with the correct wheel for us to use as and when. At one point they even brought me some wheels for site use. Still at times they would send out bits with other gear and I built up a decent amount of new unused sds bits including a screwdriver bit holder and have never had to buy a bit in my life . Pretty much the same story for hss bits and a fair few auger bits too.
Takes a moment or two to sharpen bits and I'd rather do that than fork out for more but I suppose if some are happy to do it the other way round then it's up to them.


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 Post subject: Re: Sds drill bits
PostPosted: Wed Dec 12, 2018 12:36 pm 
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I read somewhere that friction heat causes welding of metal particles onto the bit from the dust in the concrete that dulls the cutting action. I cannot recall where this was, but I suppose there is going to be rounding of the tip through abrasion as well. :scratch:

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 Post subject: Re: Sds drill bits
PostPosted: Wed Dec 12, 2018 12:46 pm 
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Based on how rounded my SDS points and chisels become I have to agree - mind you I do sharpen those - on account of never ever being given any of them.

Thinking about it, just how would you go about re-sharpening a 7mm 3-flute or 4-flute SDS bit?
Attachment:
Heller TriJet 001_01.png
Heller TriJet 001_01.png [ 86.22 KiB | Viewed 693 times ]

Surely that's quite a complex grind for such a small bit. 2-flute bits are a lot easier:
Attachment:
SDS Bit 2-Flute 001_01.png
SDS Bit 2-Flute 001_01.png [ 67.95 KiB | Viewed 691 times ]

and as for 4-flute:
Attachment:
SDS Bit 4-Flute 001_01.png
SDS Bit 4-Flute 001_01.png [ 66.42 KiB | Viewed 691 times ]

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 Post subject: Re: Sds drill bits
PostPosted: Wed Dec 12, 2018 2:59 pm 
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Job and Knock wrote:
Grendel wrote:
Does everyone just dump their bits once they go dull? No one actually sharpens them ? I only ask because I touch up mine and get much longer life out of them.

Rorschach wrote:
I sharpen pretty much all my drill bits but I don't imagine full timers have the time or tools to do that.

No we don't. In any case the firm often issue them FoC, so I for one buy very few 5.5 or 7mm drill biits myself, only for the odd private job.....

Hitch wrote:
Doesnt sound bad really if its in decent concrete... just buy more bits. Theyre consumables at the end of the day.

And there's the rub - in dense concrete I reckon that at 30 or so holes most bits have had it (the cheap ones won't get half that distance, the Hilti ones do better, but even they give out eventually and at the price they are I don't see them being any cheaper per hole). In softer brick, sandstone, blockwork, etc you'll easily top 100 holes


Must be me then.most of the time im drilling brick,i get mine supplied by the company just have to buy them and keep the receipt,it was just the boss commented that he only reimbursed me two weeks ago
thanks for all the reply's everyone

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 Post subject: Re: Sds drill bits
PostPosted: Wed Dec 12, 2018 4:05 pm 
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it's not just you mate. I just looked in my van and the cheap ones I bought were Titan ones and they are sheeeite. They last 36 drill holes in the road and then they are half as slim as when new. I'll never buy them again.


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