MarkJohnston wrote:Very nice jig indeed.
Can you tell me what toolpath, bit, speeds and feeds you use to drill all the cribbage boards?
I'm having a lot of burning when I drill that many holes. I have a porter cable router so the slowest I can run is 10000 RPM.
Just curious how you are doing the holes?
Thanks for showing us the jig.
4DThinker wrote:Very clever indeed! Just curious if it centers horizontally too?
4DThinker wrote:I've had good luck using a 1/8" (good quality) drill bit in a 1/8" collet adapter to drill arrays of 1/8" holes. Turn the router down to its slowest setting. Set my plunge speed to the fastest the machine would allow, clearance Z to .05, and peck drilling if the holes were very deep. Machine acceleration limits won't let the travel between holes get very high, so greatest gain comes from plunge speed and minimal clearance Z.
I don't remember off hand but I'll guess 10,000rpm on the 1 (out of 6) setting on the speed dial. Dewalt 2.5hp router. I haven't done a lot of hole drilling, but one of my students wanted a 3/4" x 3/4" spaced array of 1/8" holes across a 24" x 48" pieces of BB plywood. I started with a 1/8" spiral upcut 2-flute carbide bit but switched to a coated drill bit when that router bit started smoking holes. The drill bit pulled chips out faster as it drilled and looked no worse for wear at the end.Mark's Wood Chips wrote:What do you think the RPM is at your lowest setting? I can go much slower but I based the RPM by the look of the chips. I do get occasional darkening inside holes of real sappy wood and, after running hundreds of blanks, I have to wash the collet, nut and drill. I use a Drill Doctor to sharpen the drill and the drill is probably sharper than new, lasting for thousands of holes.
I have tried using an end mill and an end mill that I ground to a point, neither of which did as well as a standard 118 degree point drill.
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