Ken Parker Archtoppery - Riff 001: Grinding a Spur (aka Brad Point) Bit
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- เผยแพร่เมื่อ 22 ก.ย. 2024
- Starting with a regular twist bit, we grind a spur ( aka brad point ) bit and illustrate the differences between them.
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This video is part of Ken Parker's Archtoppery series. We recommend you check out his Archtoppery page on his website: kenparkerarcht...
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A new guitar design, especially innovative design, require making new tools and jigs which takes probably more time than making actual guitar. It is a genuine pleasure to watch you making tools that makes your work precise, efficient and beautiful. Kudos!
Thanks, K!
Excellent job, Ken. You're hired!
When do we start?
Excellent ! I will do it to some of mine. Thanks a million for teaching us !
It's easy, and you can play with the angles to address the needs of different materials. Have fun!
@@kenparkerarchtoppery9440thanks for that tip ! to play with the angle as it is limiting the thickness of the chop. It is the equivalent of the angle of the filets on a screw the speed of the penetration by rotation. As I am a french speaker, please excuse me for my approximations in english.
I love your smile of satisfaction and happiness with that lovely donut finish !
And here's how I modify this tool so I can use it to modify this other tool! Brilliance all the way. I learn a ton by watching these videos.
Glad to help
thank you so much Mr. Parker! i have difficulty finding quality brad point drill bits and this video is very helpful for making the tools i need for my guitar construction.
Tool geometry and grinding is as close to magic as we get in the shop!
Very useful bit geometry, in the shop i used to work at there was a set that someone had forgotten, and they produced very shapr holes, and the vibrations using the press drill were significantly lower. Thanks again for sharing :D
Grinding well will get you out of almost any tight spot in the world of cutting stuff.
I'm amazed at how clean the exit hole is. I think I need to get my hands on some decent quality brad point bits for my drill press. I have a hand cranked one which applies a fair amount of downwards pressure and often leads to tear out at the exit.
Thanks for the informative video!
In my experience, "decent quality" are the ones you grind yourself. Go for it! You must have some junky bits around that you can practice on.
Thank you so much!
Grind on, goldenfishbank!
Machinist as luthier. This guy is just fantastic!
Thanks! Big Fun is what it is!
Impressive results!
Thank you!
so impressive Ken!....hopefully you can show how you attach your necks and the adjust on your archtops.....
We'll get there! First, carving plates!
As if I don’t already have enough to do, now I have to grind my own Brad Point bits! 😄 Seriously, thanks for the explanation of the steel alloy. I was getting concerned when you didn’t cool the bit in some water while grinding.
HSS is a godsend for drills, so tough! Small bits are better addressed with a Dremel or some such with a little grinding wheel. I normally only grind what I can't buy, except, of course, if I need it RIGHT NOW, and won't wait for the postmen.
welcome back
Thanks!
Thank you for practical tips
My pleasure!
@@kenparkerarchtoppery9440 Fred W speaks highly and fondly of you
Very good results, what size wheel and what grit? Thanks
I think it's a 46 grit white aluminum oxide wheel, 1/4" wide. The industrial grinders normally used in machine shops include surface grinders and universal tool and cutter grinders, both of which I own and use occasionally. These tools in the US normally are designed for 1 1/4" hole and 7" diameter for reasons I can't explain to you. The pedestal grinder I use here, and most "bench" grinders are fitted with a 5/8" shaft, so you'll need adapter bushings to run wheels with the larger 1 1/4" holes. These can be bought from your wheel supplier or made on your lathe. The variety of wheels available in these dimensions is mind-boggling, but you normally would only need a few different types to do most precision grinding jobs. Grinding motors usually turn at 3600 RPM, so the SFM rates are quite high, it would be 7500 surface feet/ minute for an 8" diameter wheel when new. It might surprise you to know that this high speed means that the grit size affects the surface finish much less than you might imagine, and 46 grit is quite commonly used to get a nice balance between stock removal rates and the quality of the surface finish, unless you are grinding fussy little slots or need truly sharp inside corners.
Normally, fine grit wheels are only needed if you require very sharp inside corners, and are capable of removing very little material before dulling and requiring reshaping by dressing.
Could you drill a long hole for say a truss rod with that?
long holes in wood are really tough! After drilling just a few drill diameter's depth, a regular twist drill can easily be diverted from its ideal course by variations in hardness and grain fiber direction in the wood. This can happen even in metal, and to an extent that will surprise you! There are drill styles that are more likely to drill straight, look up gun drills. Problem is, the drills for deep holes are designed for metal, and tend to depend on a lubricant. In wood, a friend has had excellent success drilling very small holes with a spoon bit, drilling a tiny amount and constantly retracting the drill and clearing the hole. He reports that repeatedly freezing the drill also was helpful, as it tends to prevent heat from hardening resins in the wood during drilling. Having said all this, yes, the brad point/spur bit will track significantly better than a standard drill point.
More on the NASA side of the shop please! Thanks Ken
More to come!
Wow. Very cool vid! Gonna try my hand at this sometime.
Btw ken, I think that bit is larger than 23/64. I happen to have a couple of 23/64 bits within arm's reach at the time of watching this. The hex head of the truss rods i use require 23/64 holes. Either you have tiny hands, or those are some large bits!
OOOPS Sorry, of course I mis-spoke, 23/32" it is, right between 11/16" and 3/4"
Impressive results!
Thank you!