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Where To Get Sets and Parts For discussions about swapmeets, rallies, NVCF and BVWS, car boot sales, antique and charity shops, dealers, newspaper adverts, the local tip and just about any other source of equipment (other than eBay). |
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27th Feb 2019, 5:39 pm | #21 |
Octode
Join Date: May 2016
Location: Oxfordshire/Bucks borders, UK.
Posts: 1,604
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Re: Drill bits
I always buy loads of small drills, they break, get lost. 4mm upwards I can sharpen on a bench grinder, so only buy more of those if I break one.
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Avometer, vintage Fluke and Marconi collector. Also interested in vintage Yaesu and KW. |
27th Feb 2019, 6:36 pm | #22 |
Dekatron
Join Date: Apr 2009
Location: Oxfordshire, UK.
Posts: 4,924
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Re: Drill bits
I always keep a good 3mm cobalt drill in a plastic box in my tool kit. If I can get a 3mm pilot hole, making larger holes is largely a question of mental attitude, even in adverse circumstances.
B
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Saturn V had 6 million pounds of fuel. It would take thirty thousand strong men to lift it an inch. |
27th Feb 2019, 9:50 pm | #23 |
Heptode
Join Date: Oct 2015
Location: Gloucestershire, UK.
Posts: 719
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Re: Drill bits
I bought some drills from Carrefour in France. I still can't believe how *good* they were :-(
First one went banana shaped when pressed to the work. Next one ended up with a glowing bulbous tip and the twist tightened. Unbelievable that anything so utterly useless could make it to market. |
27th Feb 2019, 10:35 pm | #24 |
Dekatron
Join Date: Aug 2016
Location: Colchester, Essex, UK.
Posts: 4,081
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Re: Drill bits
Youtuber 'Moonfleet41' has done a practical review of a budget drill bit sharpener available from more than one UK outlet. Lacking the will to dress my bench grinder wheels properly and learn how to regrind drill bits manually, i think i may get one. It looks a bit plasticky and if you constantly reground badly damaged 10mm bits with it the stone wouldn't last too long, but it does seem to take care of the correct angles, and gives an accurate centre to avoid drill wobble. It relies on a drill to power it (fair enough; why pay for an extra electric motor that you only use occasionally?)
Dave |
28th Feb 2019, 7:34 pm | #25 | |
Dekatron
Join Date: Apr 2009
Location: Oxfordshire, UK.
Posts: 4,924
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Re: Drill bits
Quote:
B
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Saturn V had 6 million pounds of fuel. It would take thirty thousand strong men to lift it an inch. |
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28th Feb 2019, 8:16 pm | #26 |
Tetrode
Join Date: Oct 2016
Location: York, North Yorkshire, UK.
Posts: 54
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Re: Drill bits
Isn't 'Titanium' just Aldi's name for the're better quality tools (usually red) as opposed to 'Workforce' for the're lower quality and cheaper tools (usually blue)?
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28th Feb 2019, 9:08 pm | #27 | |
Dekatron
Join Date: Apr 2009
Location: Oxfordshire, UK.
Posts: 4,924
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Re: Drill bits
Quote:
Just once, I had a drill some holes in a piece of titanium alloy and expected it would be hard work. It actually quite drilled easily with a cobalt drill. B
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Saturn V had 6 million pounds of fuel. It would take thirty thousand strong men to lift it an inch. |
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2nd Mar 2019, 9:04 pm | #28 |
Heptode
Join Date: Jun 2017
Location: Southport, Merseyside, UK.
Posts: 646
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Re: Drill bits
I try to avoid the use of a centre "pop" to locate a drilling position. I fit a small lathe type centre bit into a pillar drill. These bits have very short small point at the tip of a thick
( 1/4" or so ) shank and do not "wander"
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Time flies like an arrow, fruit flies like a banana |
2nd Mar 2019, 9:27 pm | #29 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,193
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Re: Drill bits
Centre punching is part of the marking out process so that the hole is drilled in the right place. It's difficult to feed a drill down to the precise interscection of two scribed lines, but very easy to centre punch the intersection and feed into that. Just rest the centre punch in one scribed line and slide it along until you feel it drop into the other one.
If you're not going to use a centre punch it's better if you use a proper spotting drill, which is what I use in my CNC milling machine. Centre drills are intended for drilling centres in lathe work pieces intended to be mounted between centres. All to easy to break in my opinion unless your lathe has a lever feed tail stock. A screw fed tail stock is like using a screw type car jack and has no "feel".
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
2nd Mar 2019, 10:42 pm | #30 | |
Octode
Join Date: Dec 2017
Location: Morden, Surrey, UK.
Posts: 1,552
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Re: Drill bits
Quote:
I sometimes use a small centre drill for starting 3.8 mm holes in front panels - gives more accurate results than going straight in with the finished size. |
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2nd Mar 2019, 11:12 pm | #31 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,193
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Re: Drill bits
We all have our own ways of doing things and so long as it works for us that's fine. This is a hobby and we're not aiming for max production rate.
My late father's Myford Super 7 had a lever feed tail stock for drilling and it was a joy to use when drilling small diameter holes. You could feel directly how the drill was cutting and pecking to clear chips was easy. The worst thing about breaking a centre drill is that unless you have something like a spark eroder to get the tip out, you have to scrap the workpiece.
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
2nd Mar 2019, 11:31 pm | #32 |
Rest in Peace
Join Date: Dec 2004
Location: Newcastle Upon Tyne, Tyneside, UK.
Posts: 420
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Re: Drill bits
I always prefer to use micro radium tipped drills for non porous surfaces. Mind you I had to attend the special training seminar at Goon show HQ to qualify
Paul. |
3rd Mar 2019, 12:48 am | #33 |
Nonode
Join Date: Oct 2014
Location: West Midlands, UK.
Posts: 2,181
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Re: Drill bits
One of the reasons I mentioned these was that there's a fw small size ( PCB EVEN) sized drills in th box. We all know just how tough PCB are on bits ( specially fibre boards), si I thought that Titqnium might last a bit longer. But for those that prfer HSS, Aldi also do a set of HSS bits, with each set containing a good few 1/2mm bits.
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