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**-Sam-** · 10-29-2004, 06:05 PM

Is it best to use a 1/4" upspiral bit to cut circles than using a straight bit? I figure the slicing action of the upspiral is better for wood than the straight bit which has a chopping action. Just a thought.

Later...

Boricua

reible · 10-29-2004, 07:57 PM

If you use the search along the top bar you can find some more interesting reading on spiral bits.

The simple answer is as you say......

Ed

Dewy · 10-31-2004, 10:15 AM

I use a 1/4" HSS milling machine cutter in my table when routing stopped grooves for bread board edges.
The spiral is the same as the upcut ones and it clears the swarf immediately as it is throwing it down.
I wouldn't use anything else for this application.
When the cutters I have get blunt I will buy some from an engineering supplier.
The ones I use have 3 flutes which are far beter than 2 or 4 flute cutters.
Engineers have known for a great many years that an uneven number of cutting edges work a lot better than any even numbered tool.
Despite this manufactureres still stick with 2, 4, 6, 8 flute etc.
I learned this from my father who worked on aero engines in WW2.
He ground tested the planes before the test pilots took them up.
This was at GAC where the Whittle jet was made and tested.
The chief test pilot, Gerry Sayer, who flew the 1st jet, was my dads drinking buddy during those dark years.
Gerry Sayer, Peggy to his friends, knew the engines were in top condition after my dad had tested them for him.

10-29-2004, 06:05 PM	#1
-Sam- Retired Moderator Forum King Join Date: Sep 2004 Posts: 632 View -Sam-'s Gallery	Report This Post! Upspiral Bits Is it best to use a 1/4" upspiral bit to cut circles than using a straight bit? I figure the slicing action of the upspiral is better for wood than the straight bit which has a chopping action. Just a thought. Later... Boricua
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10-29-2004, 07:57 PM	#2
reible Registered User Supreme Forum King Join Date: Sep 2004 Posts: 1,703 View reible's Gallery	Report This Post! If you use the search along the top bar you can find some more interesting reading on spiral bits. The simple answer is as you say...... Ed
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10-31-2004, 10:15 AM	#3
Dewy Registered User Forum Fanatic Join Date: Sep 2004 Posts: 120 View Dewy's Gallery	Report This Post! I use a 1/4" HSS milling machine cutter in my table when routing stopped grooves for bread board edges. The spiral is the same as the upcut ones and it clears the swarf immediately as it is throwing it down. I wouldn't use anything else for this application. When the cutters I have get blunt I will buy some from an engineering supplier. The ones I use have 3 flutes which are far beter than 2 or 4 flute cutters. Engineers have known for a great many years that an uneven number of cutting edges work a lot better than any even numbered tool. Despite this manufactureres still stick with 2, 4, 6, 8 flute etc. I learned this from my father who worked on aero engines in WW2. He ground tested the planes before the test pilots took them up. This was at GAC where the Whittle jet was made and tested. The chief test pilot, Gerry Sayer, who flew the 1st jet, was my dads drinking buddy during those dark years. Gerry Sayer, Peggy to his friends, knew the engines were in top condition after my dad had tested them for him. __________________ Dewy support team at Paltalk voice chat program
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