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11th Jun 2021, 05:57 PM #1Most Valued Member
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Horizontal Bandsaw Flat Stock Tip
Joe Pieczynski did a video a while ago comparing cutting speed in a horizontal bandsaw with various orientations of the stock. He found that having the stock at an angle was fastest. His saw vice had a lip on the rear face to hook the stock under. Mine doesn't, but I found that two K-clamps works really well. I have extended my vice jaws, so the clamps clear the saw's frame.
Chris
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11th Jun 2021, 06:43 PM #2Member: Blue and white apron brigade
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Good to know. I also use that orientation with angle whenever I can.
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11th Jun 2021, 09:39 PM #3
Hi Guys,
That was the reason that I created a lip on both vise jaws, though you do have to take care to set the work so that the blade cannot grab and pull the work upwards.
10-08-2019-005.JPGBest Regards:
Baron J.
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11th Jun 2021, 10:12 PM #4Most Valued Member
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I’m not following John. Can you please post a pic with the jaws open so we can see the lip(s)?
Chris
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11th Jun 2021, 11:08 PM #5
Generally speaking , the idea is an improvement of blade performance, though some thought should also be given to the maximum number of teeth to be engaged in the width of cut.
While the reasons for the minimum amount of teeth to engage the cut width are discussed often often enough, perhaps ,not so for the maximum teeth to be engaged in the cut.
Probably not ,something that one runs up against too often, but it does arise on some occasions.
Consider that as the slope of the steel flat decreases ,the teeth contact increases the number of teeth engaged.
The same occurs when a flat bar is laid horizontal and cut using the wrong TPI.
With excess teeth in the cut, overheating occurs as the saw gullets cannot eject the swarf quickly enough and overheating and blade point damage ensues.
I know I will be asked for a number but I can't give it as I can't find the original reference to it from one of the bandsaw blade manufacturers published guides. I think it was the American Morse bandsaw notes, but still unable to locate it.
I dealt with the Morse company seeking useful information while setting up a very expensive Macc unit for a past employer .
If recommended procedures were followed, we had no problems. It was only the monkeys got to it and did not use laid down procedures,were there problems.
Just food for thought. Perhaps rethink the TPI number when doing this.
Grahame
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12th Jun 2021, 12:08 AM #6Most Valued Member
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I was about to post that due to the hinge point of the saw being at the bed level, simply raising flat stock up a bit means the blade will be at an angle as it goes through.
I’m guessing that’s what you’re achieving with creating a lip at the top of the jaws for stock to sit on?
Steve
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12th Jun 2021, 03:28 AM #7
Hi Steve, Guys,
That is about the size of it ! You do have to take care that the arm doesn't suddenly drop at the end of a cut and land hard on the switch. I place a block of wood under the arm to stop that.
09-08-2019-006.jpg
Is this a better picture Chris ?Best Regards:
Baron J.
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12th Jun 2021, 10:21 AM #8Member: Blue and white apron brigade
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This chart is a guide I generated some time back from data I extracted from the Ellis Bandsaw Co website in the US.
Remember it's only a guide for optimised cutting.
The right hand vertical axis is the "Thickness of material" (T in inches)
The left hand vertical is the resulting "Teeth in cut" (TIC)
The horizontal axis is the TPI
The blue and black lines refer to TIC (LH axis) and the green and red lines to the thickness (RH axis)
Blue and red refer to round stock, and black and green refer to tube stock - in this case the Thickness refers to wall thickness.
For all practical purposes there's not much difference between round and rectangular stock.
Screen Shot 2021-06-12 at 7.19.59 am.png
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12th Jun 2021, 10:36 AM #9Most Valued Member
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12th Jun 2021, 10:37 AM #10Most Valued Member
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12th Jun 2021, 10:43 AM #11Most Valued Member
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Here's the video in question: https://www.youtube.com/watch?v=5fvhbhTxF0c&t=606s
He found the tilt method to be substantially quicker than the raised method John uses (1:50 vs 2:50).
And both obviously quicker than the conventional method (3:27).Chris
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14th Jun 2021, 12:52 AM #12
Hi Chris, Guys,
I've just found the picture that I wanted to post !
25-05-2021-005.JPG
Showing how I use the bandsaw vise when cutting wide flat stock.Best Regards:
Baron J.
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