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Discussion on Metal Fabrication Machinery including Q&A on maintenance and repairs. Plasma, Lock Formers, Brakes, ect.


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Old 01-10-2017, 08:11 PM
Coro Coro is offline
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Default How to minimise shear guillotine pulling sheet as it cuts

We have a shear guillotine which seems to pull the sheet through quite a bit as it cuts, and am wondering if this is considered normal or does the machine need some attention?

It can pull up to 2mm when cutting a 1.2 mt sheet of 24g (.55mm) stainless. The pins that clamp down on the sheet seem to be doing a good job - there is no way I move the sheet when I pull on it with all strength.

It doesn't pull as much with galv, but .55 would still probably pull 1mm along a 2.4 mt length.

This is the only guillotine I have used, so not sure if this is normal or not. Would it be due to the blades needing to be sharpened, or gap adjusted?
I know the end that starts the cut (and gets used the most often) creates a reasonable burr, so does need a sharpen at some stage.
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Old 01-11-2017, 09:06 PM
MattM MattM is offline
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Sounds like a gap issue.
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Old 01-14-2017, 12:36 PM
Joeysmith Joeysmith is offline
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Quote:
Originally Posted by MattM View Post
Sounds like a gap issue.
X-2. Ours will get to doing the same thing when it gets out of adjustment.
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Old 01-14-2017, 03:38 PM
MattM MattM is offline
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Check all the nuts along the blade. They may also be loosening.
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Old 01-22-2017, 09:03 AM
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Stickman Stickman is offline
 
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Funny mine started doing this a few months back. It would not pull in much, but a 1/16 is too much. My blades still cut like new and I hadn't really messed with any adjustments, so I figured the pads on the hold down were worn or polished. I took off the hold down bar and made new rubber pads out of some roll rubber (like used on overhead doors) and glued the new pads on the hold down bar. While the bar was off I cleaned and wire wheeled the bed where the pads meet to insure they were clean again. PRESTO, this made the stock not move at all again. Now this could be from a gap issue as well as Matt stated, but something you could look into as well.
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