Speedbor 32 mm - Page 2 - Woodworking Talk - Woodworkers Forum
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post #21 of 28 Old 08-08-2019, 09:56 PM
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In case it matters, two days ago I drilled four 1-3/8 inch holes, 1/2 inch deep into the end grain of a mahogany turning blank. 1-3/8 inches is slightly larger than the 32 mm that @Shay wants. It isn't that large.

(After that, I drilled four 7/8 inch holes, 1/4 inch deep in the center of the previous holes.)

I tried my old Forstner bit on my underpowered drill press, but got nowhere. The bit burned and burnished the wood, but it would not drill, even when I applied enough pressure to almost stall the drill press. I looked at the Forstner bit and it is shot, probably past the point of salvaging with diamond files.

I bought a new Forstner bit it made all the difference. The new bit drilled correctly, but the drilling was still slow. I am methodical, but it took me a couple hours to measure and make the holes. Some of the time was spent checking the depth, and some of the time was spent clearing the hole along with resting/cooling the bit.

My point is that drilling a large hole in end grain hardwood can be slow. It takes a sharp bit, plus time and patience. Take small bites and allow time for your drill bit to cool between bites. Keep the hole clear as you drill.
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post #22 of 28 Old 08-09-2019, 12:47 AM
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So far I have not heard any drill speed mentioned, a 1 1/4" Forstner bit should be turning no more than 250 RPM in hardwood.

http://sawdustmaking.com/Free%20Charts/Bit%20Speed.pdf

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post #23 of 28 Old 08-09-2019, 09:02 AM
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Watch this video in real time...Impressive!

https://www.infinitytools.com/colt-m...iAAEgL24_D_BwE

Gary

Last edited by gmercer_48083; 08-09-2019 at 09:07 AM.
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post #24 of 28 Old 08-09-2019, 10:27 AM
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Quote:
Originally Posted by FrankC View Post
So far I have not heard any drill speed mentioned, a 1 1/4" Forstner bit should be turning no more than 250 RPM in hardwood.

http://sawdustmaking.com/Free%20Charts/Bit%20Speed.pdf
Good point.

The 1-3/8 inch Forstner bit I used on the end grain mahogany was marked not to exceed 620 RPM. My drill press' lowest speed is 600 RPM, so I set it there.

The chart you posted would have me use a lower speed for the hardwood, but it was not available on my drill press. I was careful to drill slowly, keep the hole clear, and allow plenty of time for the bit to cool between "bites." It worked well.
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post #25 of 28 Old 08-09-2019, 11:25 AM
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Cool I suggested a Forstner bit here .....

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Originally Posted by woodnthings View Post
Why not use a Forstner bit like this:


https://www.rockler.com/individual-s...waAq2sEALw_wcB

or this:
https://www.amazon.com/uxcell-Forstn...gateway&sr=8-9

https://www.amazon.com/Senzeal-Woodw...ateway&sr=8-10





Just apply pressure, no auger tip to keep clean and cheap!!!!!



This excellent video explains the different types:

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
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post #26 of 28 Old 08-10-2019, 01:12 PM
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In simplistic terms there is a direct relationship with any cutting tool between the speed of rotation and the feed rate, when a bit is turning too fast and fed to slow friction builds up causing heat which will ruin the bit.

Most of the small bench top drill presses are not suitable for large diameter drill bits, they are both under powered and rotate too fast.

The same can be said for most single speed small capacity hand drills.
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post #27 of 28 Old 08-13-2019, 02:53 PM Thread Starter
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Hi,

So I tried a 30mm forstner bit (similar diameter to the speedbor of irwin) and it made the job!
It took time but the bit drilled down eventually...
Now it makes me wonder, maybe the new 32 speedbor That I bought is a defective one..

Thanks guys for the help!
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post #28 of 28 Old 08-14-2019, 06:27 PM
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Quote:
Originally Posted by Shay View Post
Hi,

So I tried a 30mm forstner bit (similar diameter to the speedbor of irwin) and it made the job!
It took time but the bit drilled down eventually...
Now it makes me wonder, maybe the new 32 speedbor That I bought is a defective one..

Thanks guys for the help!
Try taking it back to where you bought it and see what they can do for you, nothing to lose except your time.

“Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth.”
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