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3rd February 2020, 08:14 PM #1
Please Explain - Guides Position Influancing Cut
I have a Hammer 4400 Bandsaw with ceramic guides and on the weekend I took of the top guide assembly for a quick clean. Dust and stuff.
I then remounted the guides, however after remounting the guides the saw developed an extreme drift. Franticly I researched around what I have done wrong to no avail.
I have had this machine for three years and never had it not cut perfectly.
I then realized that I had positioned the ceramic guides forward of were they were before. My reasoning had been to give the 27mm blade more support in its width.
However as soon as I moved the guides back to about the half way mark the saw started cutting strait again, no drift.
Why did reducing the support offered by the guides eliminate the drift?
As you can see in the photo the blade has a clear line were the guide had been positioned by the Felder technician when he delivered and installed the bandsaw three years ago.
I feel like I have been smoking something as it makes no sense why this little change would have such a major influence on the machines performance.
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4th February 2020, 01:02 AM #2
Did you adjust the push wheel at the back of the blade when you brought them forward ? If that came forward with the side guides and the blade back was running on it you would get deflection / drift .
I dont have this brand saw but there all basically the same . To set up the blade runs free of all side and behind blade bearings / guides . They are all set just off a free running blade that runs in the correct position on the wheels .
This guy may help you . The rear push wheel as he calls it , rear bearing, is talked about at the 3.55 minute point .
YouTube
Rob
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4th February 2020, 06:42 AM #3
Thanks for the link and tonight I will try with some adjustment to see what works.
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