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2nd August 2019, 05:44 PM #16GOLD MEMBER
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2nd August 2019, 05:44 PM #17Taking a break
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I have mentioned it in a few threads previously but happy to do so again, it's reeeeeaaaally easy. The setup is simply a 6" x 1/4" wide wheel that's dressed to the shape of the bit. Set the tool rest to the back clearance angle and away you go. That grinder is permanently set, so touch-ups are a 15 second job, fully shaping a bit is just a minute or two once you've had some practise.
IMAG1487[1].jpg
The sizes you can do is only limited by how sharp the point on the wheel is and how delicately you can manipulate things by hand. I have gone down to 3mm once as a favour for someone here who wanted a brad point that small, but it's not something I'd like to do regularly; 5mm is a pretty comfortable lower limit for me.
IMAG1485[1].jpg
Side note: I've noticed that Carbatec stock CMT brad point bits from 2mm, but at about triple the price of a standard Sutton Viper bit from Bunnings Individual - Carbatec
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2nd August 2019, 10:34 PM #18GOLD MEMBER
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[QUOTE=elanjacobs;2150894]I have mentioned it in a few threads previously but happy to do so again, it's reeeeeaaaally easy. The setup is simply a 6" x 1/4" wide wheel that's dressed to the shape of the bit. Set the tool rest to the back clearance angle and away you go. That grinder is permanently set, so touch-ups are a 15 second job, fully shaping a bit is just a minute or two once you've had some practise.
IMAG1487[1].jpg
QUOTE]
Elan, I have not seen your previous posts. Could you please explain this a bit more. My Brad point bits appear to have 90° V's in them. So is your wheel ground square with 90° corners and you use the corners or is it ground to a 90° point?
Thanks,
Rgds,
Crocy.
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3rd August 2019, 09:11 AM #19SENIOR MEMBER
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RS Components appear to have a reasonable range of Dormer bits.
(I have no connection/affiliation with RS Components)
Yvan
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3rd August 2019, 10:52 AM #20.
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Thanks for the lead.
I had a look at the RS (now called Element14) bits between 6 and 1 mm.
There are ~75 sizes/types listed in this size range, but all bar 15 are listed as available, the others are listed as "no longer available"
Of those that are available they have a tag "Available until stock is exhausted" AND in most cases they appear to only have single digit amounts remaining in stock.
Same applies to the Dormer sets
Based on this it appears that they are getting out of supplying Dormers.
The prices range from $47.20 for a single 6mm bit, to under $5 for all the other bits in this size range.
By way of comparison a 4mm bit is priced at $3.36 compared to a Bunnings Sutton Viper at Bunnings for 2c under $4.
If you buy $50 worth of stuff you get free delivery
Of course none of the sizes I regularly use are available!
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3rd August 2019, 11:10 AM #21GOLD MEMBER
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actually I don't think RS Components are related to Element14....
Element14 are a Premier Farnell company, which is now an Avnet company.
RS Components are an ElectroComponents company.
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3rd August 2019, 11:30 AM #22.
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Sorry always get confused between these companies.
Had aquick look at the RS site, plenty of stock there including some of the 0.1mm increment sizes I have been chasing for some time.
Prices for a 6mm bit range from $90 for a carbide, to $17 for a CoHS and $6.80 for individual HSS bit. If you buy a set of multiples they cost as little as $4 ea.
Time to get restocked on a few sizes.
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3rd August 2019, 08:01 PM #23Taking a break
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None of the above.
The brad points you can buy have a much more pronounced angle than how we made them. The pic of the grinding wheel is taken top down; about a 10-15 degree angle straight across the wheel.
The bits are held pretty much straight on, with the back of the bit just slightly angled out so the centre point comes to a point and is not left square at the tip, and with the 3 points of the bit (the 2 outer spurs and the centre point) all in a line parallel to the tool rest so there is no funny business trying to make a V with a square wheel. The shape of the wheel does all the work.
I might wander down to my old work and take some more pics of the process for a proper tutorial thread.
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4th August 2019, 10:03 AM #24GOLD MEMBER
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4th August 2019, 12:00 PM #25
Plus one for Dormer brand, only ones we used at work doing a heap of stainless steal work.
We would also from time to time use ARTU Bits which had a T/C tip.
Got them from the local Engineering Supplier. Cheers crowie
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9th August 2019, 08:08 PM #26
Thanks everyone for your input. I've ordered a set of 19 Dormer bits from RS Components for $115. I'll report back on their performance.
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21st August 2019, 10:44 AM #27
The drill bits arrived (finally) and I'd have to say at first glance they appear to be well made and sharp. It's early days yet and I haven't really given them a good test but if the case they came in is any indication of quality (and it often is) then I think they will serve the purpose well. The few holes I have drilled (in hardwood) have been done with little resistance.
Value for money? Depends how you measure it. I had mentioned in my original post buying a single 8mm bit (Sutton) from Mitre10 for $14.99 and it being useless when trying to drill mild steel. The set I've now bought cost $115 and there are nineteen bits, but they're all of different sizes so it's hard to compare the value. Obviously a larger bit is going to be more expensive than a smaller bit. But given that I could only have bought seven of the Suttons bits for $115 then it seems good value to me though you could argue that if you only wanted to drill a few 8mm holes then it's expensive. However the Suttons bit at $14.99 (or even $2.99) wasn't good value either because it didn't do the job...
In any event I'm happy with my purchase. Thanks for the heads up from those who suggested it.
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