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Post by Barry K on Apr 7, 2019 8:02:11 GMT -5
I am doing several projects and have something I am designing that will require several eighth inch hole drilled through three quarter inch thick material. What bit should I use or can I use a actual drill bit . I haven't done any drill with my machine as yet and don't know the proper procedure and tooling
Thank you in advance for your help
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Post by stevem on Apr 7, 2019 9:23:16 GMT -5
I would use a 1/8" end mill that has a cut depth of 3/4" and use the drilling tool path with pecking motion so the hole is cleared out while drilling. I have used this method when making a cribbage board and it works great. I don't know if a actual drill bit would work with the cnc, but you could try it on some scrap and see what it looks like. If it looks good, try the drill bit.
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Post by Barry K on Apr 8, 2019 12:17:27 GMT -5
Hard to find a 1/8" end mill that has a cut depth of 3/4" If you were using the pecking motion toolpath and the bit was a 1/8" shaft would it be seasonable to use 1/8" end mill that has a cut depth of 1/2 to cut a 3/4 in deep hole ?
Thanks
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Post by stevem on Apr 8, 2019 13:12:58 GMT -5
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Post by Axiom Tool Group on Apr 8, 2019 13:58:30 GMT -5
A regular brad point drill bit will work...you just need a collet to fit it. Then lower the RPM to a suitable range and adjust the plunge so that it nice and smooth.
If you plunge too fast, you may snap the bit.
In either regard drilling may not be regularly done but it is still very doable.
If using an end-mill...peck drilling is highly recommended. However, most end-mills are not designed to cut from the bottom...so these drilling operations increase the wear/heat that it applied to the bit and may shorten the life.
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Post by gerry on Apr 8, 2019 14:51:07 GMT -5
One of my favorite places for end mills (USA)
Kodiak Cutting Tools
They also carry extra long bits, that how I found them.
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Post by Barry K on Apr 8, 2019 16:02:07 GMT -5
I appreciate the info but the link www.ebay.com/usr/roguesystemsinc?_trksid=p2047675.l2559 doesn't work . The listing for Kodiak tools only lists a CNC mill 1/8 for 3/4 cut but for use with aluminum . I am looking for a 2 flute 1/8 in Mill that will drill 3/4 inch deep Any info would help Thanks
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johnb
Full Member
New owner @ March 2019, AR16 Elite, Aspire, 4th Axis & Laser
Posts: 326
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Post by johnb on Apr 8, 2019 16:16:31 GMT -5
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Post by gerry on Apr 8, 2019 18:43:15 GMT -5
I appreciate the info but the link www.ebay.com/usr/roguesystemsinc?_trksid=p2047675.l2559 doesn't work . The listing for Kodiak tools only lists a CNC mill 1/8 for 3/4 cut but for use with aluminum . I am looking for a 2 flute 1/8 in Mill that will drill 3/4 inch deep Any info would help Thanks From the Kodiak catalog Item Size Shank Length of cut Overall length # of flutes Coating Price 5465097 0.1250 (1/8) 1/8 3/4 2-1/4 2 TICN $14.03
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johnb
Full Member
New owner @ March 2019, AR16 Elite, Aspire, 4th Axis & Laser
Posts: 326
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Post by johnb on Apr 8, 2019 19:03:58 GMT -5
I appreciate the info but the link www.ebay.com/usr/roguesystemsinc?_trksid=p2047675.l2559 doesn't work . The listing for Kodiak tools only lists a CNC mill 1/8 for 3/4 cut but for use with aluminum . I am looking for a 2 flute 1/8 in Mill that will drill 3/4 inch deep Any info would help Thanks From the Kodiak catalog Item Size Shank Length of cut Overall length # of flutes Coating Price 5465097 0.1250 (1/8) 1/8 3/4 2-1/4 2 TICN $14.03 That's a LOT for one "drill bit" (if that's all he's gonna do with this). The ones on ebay with the 1/2" cut length are less than $4 each (in pack of 10). There shouldn't be a problem with a shorter cut length when "peck drilling". I don't know how much to plunge each, but I'd think that 1/16" at a "stab" would be conservative. Each "rise" will pull out the chips from that plunge. You could probably do this with a down cut spiral and get a cleaner "top" (no fringe).
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Post by gerry on Apr 8, 2019 19:44:02 GMT -5
NEVER drill holes with a downcut. Chips will not clear. P.S. It is not a "drill bit". It is a very nice 0.125 2-flute mill. Quite reasonable at the price.
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johnb
Full Member
New owner @ March 2019, AR16 Elite, Aspire, 4th Axis & Laser
Posts: 326
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Post by johnb on Apr 9, 2019 8:27:31 GMT -5
NEVER drill holes with a downcut. Chips will not clear. P.S. It is not a "drill bit". It is a very nice 0.125 2-flute mill. Quite reasonable at the price. No argument there, I was merely referring to his intended use (as a "drill bit"). Fourteen bucks is a good price for anything with a 3/4" shank on it. As for the downcut...it seems to me that (with 1/16" pecks), the chips wouldn't even fill the flutes before the rise of the spinning bit pulled them out and flung them off. Am I missing something here?
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Post by Barry K on Apr 9, 2019 11:56:02 GMT -5
Thank you all I have purchased the Kodiak 5465097 which has been suggested above
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Post by gerry on Apr 9, 2019 17:14:23 GMT -5
Downcut bits push the chips down into the hole. They get packed in and burn. It doesn't take too long to burn the tip of the bit. They heat up real fast.
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Post by damonlayne on May 6, 2019 15:08:03 GMT -5
Drilling cribbage holes approx 0.2" deep. I know that pecking is the BEST method for removing the chips and keeping the end of the bit from burning. That is what I am currently doing with my 1/8" EM. It is working well but I am looking for a way to go faster. Question: Would an upcut, O-Flute EM bit allow me to cut holes in one plunge?
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Post by Mezalick on May 6, 2019 16:00:36 GMT -5
Drilling cribbage holes approx 0.2" deep. I know that pecking is the BEST method for removing the chips and keeping the end of the bit from burning. That is what I am currently doing with my 1/8" EM. It is working well but I am looking for a way to go faster. Question: Would an upcut, O-Flute EM bit allow me to cut holes in one plunge? "Drilling" should be done with a drill bit. Router / CNC bits are designed to cut on the edge of the bit. Drill bits are designed to cut in a plunge action but at a much slower RPM. There are " router" bits designed with a cutting edge on the flat bottom of the bit. You might want to look into getting a "Plunge Cut" / Up-cut" bit.. Michael
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