Longworth chucks - cutting today vs. a year ago - Page 2 - Router Forums
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post #11 of 19 (permalink) Old 10-30-2019, 08:15 PM
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David, thank you for sharing. Very cool.
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post #12 of 19 (permalink) Old 11-15-2019, 10:57 AM
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Hey David, I'm gonna cut some more window frames in BB and was wondering what compression bit you're using. I'm thinking of going with a cheap one from Amazon.
Thanks.


JERRAY UP/Down Tools Made HRC55 Solid Carbide, 2 Flutes Compression Wood End Mill Router bits,1/4"Shank,1/4"Cut Diameter,1"Cutting Length,2"Overall Length https://www.amazon.com/dp/B01N5DI9BA..._yMSZDb1ZWD18P
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post #13 of 19 (permalink) Old 11-15-2019, 11:05 AM Thread Starter
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I'm on my second one of these from Whiteside (Amazon) - https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

These work great for me but they do cost a little more than the Jerray bit.

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post #14 of 19 (permalink) Old 11-16-2019, 09:31 PM
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I tried some cheap “Hozly” branded compression bits from Alibaba. Have been very pleasantly surprised. 5 1/8” ones and 5 6mm (~1/4”) cost a total of $60. For 10 solid carbide compression bits! I figured they were so cheap I would not hesitate to toss them if they disappointed, but they have been perfect. I cut a lot of 1/2” Baltic birch for a customer and I provide them with no post cut sanding. With compression bits, I do not use tabs, the chips pack in the slot and keep anything from moving.

http://s.aliexpress.com/aqq6rAnq
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post #15 of 19 (permalink) Old 11-16-2019, 10:14 PM Thread Starter
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What feed rate are you cutting when you don't have tabs, Richard? On the Longworth chucks my DC pulls most of the dust out of the slots but leaves some in the perimeter cut. If you saw the video you'll recall I cut the first pass rough and leave tabs to help hold them in place and the finish cut only removes a few thousandths plus the tabs.

It might be different with 1/8" bits, though. Your link didn't work, btw.

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post #16 of 19 (permalink) Old 11-17-2019, 06:36 PM
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Quote:
Originally Posted by difalkner View Post
What feed rate are you cutting when you don't have tabs, Richard?
David
I have been cutting using the 1/8” bits at 150ipm, .25” deep. I believe I can go faster, and will be doing some testing to see if it will do single pass. Others I have recommended the same bits to have gone faster and/or full depth successfully, but I have not tried it yet.
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post #17 of 19 (permalink) Old 11-18-2019, 08:04 AM
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Quote:
Originally Posted by BalloonEngineer View Post
I tried some cheap “Hozly” branded compression bits from Alibaba. Have been very pleasantly surprised. 5 1/8” ones and 5 6mm (~1/4”) cost a total of $60. For 10 solid carbide compression bits! I figured they were so cheap I would not hesitate to toss them if they disappointed, but they have been perfect. I cut a lot of 1/2” Baltic birch for a customer and I provide them with no post cut sanding. With compression bits, I do not use tabs, the chips pack in the slot and keep anything from moving.

http://s.aliexpress.com/aqq6rAnq
Yet another example of "high price isn't a guarantee of high quality and low price does not necessarily mean low quality"
Lots of members don't agree with me.

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post #18 of 19 (permalink) Old 11-18-2019, 10:52 AM
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we cut some circles on our cnc as well. i use a .25" down cut with tabs (0.10"). then we run them on a router table with a 1/8" roundover w/bearing. i think it will offer a more consistent rounding than the belt sander, and it cuts the tabls off perfectly flush. might even be faster...
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post #19 of 19 (permalink) Old 11-18-2019, 11:48 AM Thread Starter
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Good idea and point. It probably would be faster, Tim, but that's only if the router table and roundover bit is already set up. In my shop it is not but the belt sander is always available. The CNC finish cut manages to cut the tabs off perfectly flush so that part is over by the time I take the chuck off the CNC.

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