Do you have to drill the entire length of the bore?
I've been quite curious, what effect this will have in the long run to the wood? Any suggestions would be most welcome and forever appreciated..
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Daryl Mc.
Are gun drill bits relatively expensive or D bit's? I've heard people makin their own, if so what would you use a piece of cold steel and sharpen it down?Doogie wrote:It is done with a gun drill, Or d-bit if you don't want to buy a gun drill.. Yes, the pilot hole is made with just one drill... I'll try to post some pics if I get a chance... I'm sure others have a bunch to share/add as well...
Bill, I am using the pilot hole to center the larger cutters, i.e. I have a dowel pin in the center of the cutter to make sure that the step bores are concentric. I'll try to get a picture/drawing of the cutter assembly posted so that it makes a bit more sense.billh wrote: DMQuinn recommends step boring from the large diameter down to the smallest. I started out going the other way, but as usual David' advice was sound, and I get considerably better results taking his advice (with little pilot D bits used to center each downwards step relative to the last). The trouble is, if you've already got a pilot bore down the center which is your smallest diameter, there's no way to guarantee that it will end up being concentric with your other step bores.
There's usually more than one way to skin a cat. The dowel pin makes sense for the larger cutters. What about the smaller ones - those are the ones where it counts most, they need to be truly concentric with the pilot.daveboling wrote:Bill, I am using the pilot hole to center the larger cutters, i.e. I have a dowel pin in the center of the cutter to make sure that the step bores are concentric. I'll try to get a picture/drawing of the cutter assembly posted so that it makes a bit more sense.billh wrote: DMQuinn recommends step boring from the large diameter down to the smallest. I started out going the other way, but as usual David' advice was sound, and I get considerably better results taking his advice (with little pilot D bits used to center each downwards step relative to the last). The trouble is, if you've already got a pilot bore down the center which is your smallest diameter, there's no way to guarantee that it will end up being concentric with your other step bores.
dave boling
Well, two things - it's faster, and it saves wear on the reamers.ausdag wrote:Why not just one pilot hole and straight onto the reamer(s)?
DavidG
Err, "wooden dowels" are made of wood, yesPaisleyBuddy wrote:What's a dowel pin? Isn't dowel made of wood?daveboling wrote: I have a dowel pin in the center of the cutter to make sure that the step bores are concentric. I'll try to get a picture/drawing of the cutter assembly posted so that it makes a bit more sense.
dave boling
Dowel pins are a hardened steel pins that have been ground to a precise size (usually within 0.0001" (0.00254mm) of a particular size) with a toolpost grinder (a grinder that fits where the tool on a lathe usually resides). They are chamfered on each end. They can be press-fitted to the center of a tool for use as a pilot to assure that the cutting tool is (almost) perfectly centered with respect to the pilot bore.PaisleyBuddy wrote:What's a dowel pin? Isn't dowel made of wood?daveboling wrote: I have a dowel pin in the center of the cutter to make sure that the step bores are concentric. I'll try to get a picture/drawing of the cutter assembly posted so that it makes a bit more sense.
dave boling