1 5/8" Holes - Proper Toolpath

[BPM]

Thanks in advance!

I need to create quite a few holes in a 8/4 poplar board.

1 5/8" Diameter -- 1/2" deep -- what is the best way to accomplish this?
(toolpath and bit to use)

Thanks again!

[Kyle Stapleton]

Pocket them out.

[Brady Watson]

If they are through holes - use a profile toolpath with Inside option selected (not outside, not on) and use a spiral ramp option.

If not through holes, then a pocket toolpath to whatever depth you require.

-B

[Kyle Stapleton]

Brady, so you would not be worried about left over part flying out?

[chiloquinruss]

With a 1 5/8 diameter and a pocket toolpath there should not be a 'plug' unless it is a through hole. If it is, if you use a 1/2 inch end mill the 'plug' should only be a 5/8 plug and the dust collector 'should' take care of that. 2 cents deposited on account! :) Russ

[Brady Watson]

Brady, so you would not be worried about left over part flying out?

Nope...Like Russ says - The DC should eat it. If you git a skeered when it smack the impeller, a metal trash can & cyclone lid cures that. ;)

-B

[Kyle Stapleton]

Got it.
Thanks,

[scottp55]

Just curious, Would a 1" Mortising bit with a spiral ramp on an inside profile with a small pass depth give Brent the cut? Just wondering if the "Non-cutting" area of the bit would "disappear" if the pass depth was shallow enough? Certainly be a nice pocket finish if so, and cheaper than that size end mill.
I've been tempted to try it, but everything recently has been to go out directly to customer, so haven't had the chance to "experiment". Would certainly be faster than pocketing for production. Thanks:)
scott

[gundog]

Remember the larger the bit the less the size of the plug is so a .5" bit will leave a smaller plug for the dust collector than a 1/4" bit when doing an inside profile. With a 1 5/8" hole I would use a .5" bit and spiral it in. I try not to make holes smaller than 2 X the bit size but I do make screw holes that are 3/16" with an 1/8" bit but since a screw fits the hole the inside edge finish is not real important.

Mike

[scottp55]

Brent, I was just curious so threw a piece of scrap SPF(Spruce I think) and an old carbide tipped straight Freud (.745") on and made a couple 1.625" circles. Just used my default Maple speeds of 1.2,.5,12K as I was rushing.
Left is Profiled inside line with a spiral ramp and plug stayed put, but snapped off very close to flush with almost no pressure. Run Time :29
Right is pocket with 1"ramp. Same settings 40% stepover. Run Time 1:08
You can go quite a bit faster than that. Bit was very slightly warm, so too slow.