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Toot

Written by Čapor on 2024-09-12 at 01:01

Why exactly do top wheels on bandsaws have tilt knob? Why only around horizontal axis tilt and not also around vertical?

[#]woodworking #joinery #mechanics #machine #machining

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Descendants

Written by Dave Polaschek (he/him) on 2024-09-12 at 01:33

@ivanrancic Because the only way they need adjustment is tilting the top wheel forward or backward so the blade tracks correctly.

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Written by Čapor on 2024-09-12 at 09:53

@davepolaschek thanks. In what way specifically it's needed for tracking? My book says one should use the tilt knob in conjunction with shims to set the top circle (that defines the wheel) coplanar with the bottom one. I understand the need for being coplanar but why can the top wheel at all escape from such a position? Sure, it needs to go up and down to ensure tension but that need not necessarily compromise being coplanar. Or does it?

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Written by Dave Polaschek (he/him) on 2024-09-12 at 13:16

@ivanrancic The way the top wheel bearing slides in the slots will cause the top wheel to be less tightly held in alignment over time. In my Delta 14” bandsaw which was built before the Korean War, the slots had worn enough that I had to adjust the tilt nearly to the limit in order to keep the top wheel aligned correctly.

So, from the factory, it does not compromise being coplanar. But over time, wear will happen, and needs to be corrected, which the tilt does.

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Written by Daniel Bohrer on 2024-09-13 at 12:39

@davepolaschek @ivanrancic on the bandsaw in the shop that I work in the actual tilt of the wheel also depends on the belt tension. I usually have to adjust the tilt if I switch from a wide to a narrow blade and vice versa.

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