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universal dual head (axial)

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universal dual head (axial) | 13 September, 2007

I am currently having a problem with uncut legs on one side of axial components from a universal dual head insertion machine. Initially it was thought that the anvil on one side was engaging slow so I stripped down and changed the seals in the bottom of the anvil shafts as these were worn, also have set up the following;

anvil height to pcb, cutter stroke, back stroke gap, anvil to tooling, tooling depth to pcb, replaced both cutter and outer cutter guide, but still getting the same problem.

machine will cut some components ok on both sides but problem appears to be intermittent when running.

Any help apreciated as is starting to drive me nuts!

thanks Darron

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universal dual head (axial) | 14 September, 2007

Are you sure the anvil is coming up? You might try running a program w/o parts or boards (no continuity check) and watching to see if everything is moving when it should be.

Do you use continuity checking? If so, what are the results?

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universal dual head (axial) | 17 September, 2007

Are you using adjustable workboard holders or dedicated ones? Are both heads lined up exactly the same(using the b.e.c. template? Are parts formed correctly and lined up with the component holes on both sides(heads)?

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universal dual head (axial) | 17 September, 2007

You should check your back stroke of the cutter. The backstroke is probably too long which cause a mechanical jam when you fire the cut and clinch. The anvil goes up first and then come the cut and clinch at this point the jam should appear. There is an ajustment for the stroke lenght on both sides of your cut and clinch unit.

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universal dual head (axial) | 18 September, 2007

This would not produce the condition that Darron is seeking help for as the vcd would stop due to not seeing a clinch in signal with a mechanical jam.

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universal dual head (axial) | 18 September, 2007

Jeff, You assume too much. Not all VCD's had clinch in sensors. Darron did not tell us what vintage this machine is so what habsfan said could be the problem. We need more information to help. Does the machine stop when it doesn't cut the lead? Does the lead have any marks on it? How often does it happen? Since this is a dual head and you say 1 side does not cut, are you saying 1 side of 1 head, or 1 head, or 1 side of both heads? You may need to get some outside help. Where are you located?

- Jerry

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universal dual head (axial) | 18 September, 2007

I think Darron drove that DHVCD off'n a tall cliff.

There's a whole bunch of stuff that could cause no-cuts, but without more information (dings on leads, full insertion, dry-run performance, continuity checking results) we'd all be (and have been) grasping at straws.

Worn continuity tubes can keep leads from being inserted all the way, lead fragments jammed into the cont. tubes (that one took me a while), anvil piston o-rings shot, cutter piston o-rings shot, worn linkage, worn sleeves, cracked air lines/busted quick-disconnects, and all the other stuff already mentioned.

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universal dual head (axial) | 18 September, 2007

Thanks for all of the informations guys, after spending some time rechecking the set ups and checking for worn components in case there was something i missed, i then took some time whilst an operator ran the machine to watch. Whilst doing this i noticed that the anvils and cutters were starting to run slower and slower. I checked (again) the air both at, and to the machine which appeared to be holding at about 80-90psi, but when running started to drop out considerably. I traced the fault to the main air supply and other machinery robbing the air,I am currently in the process of rectifying it.

Thanks again to you all for the help.

Still sane.... well up to now!


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