Kupfer Muhl 4 sided planer - roller skew adjustment - Woodworking Talk - Woodworkers Forum
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post #1 of 5 Old 03-07-2019, 04:56 AM Thread Starter
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Kupfer Muhl 4 sided planer - roller skew adjustment

Good day,

We have a Kupfer Muhl planer. 600mm bed width (model VUIN 605).
It is ancient (1970's) but works well when its working

The problem I have is that timber started pulling away from the guide (standing behind the machine, the planks "drift" towards the left while feeding), resulting in only the one vertical spindle making a cut, progressively deeper as the timber is fed through...
I've measured the infeed rollers and found the top and bottom rollers to be out of vertical alignment. Weird thing is the plank is drifting TOWARDS the pinching side (is this to be expected?)


My machine was a bit butchered by the previous owners and I don't have a functioning way to adjust the infeed rollers independent of the table, and hence also can't adjust skewing on the roller.

I will appreciate if someone who has working knowledge of this machine can share how this adjustment is normally done on a non-butchered machine - Is this even adjustable at all?

Thank you
PMH
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post #2 of 5 Old 03-08-2019, 04:39 PM
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You will need to find a manual for it or someone that has experience with the particular machine. If you cannot find either one of those, I would think about hiring a machine mechanic (not auto mechanic) or someone experienced in manufacturing equipment repair. Another possible option would be a experienced machinist. Not one of these kids that program CNC machines and unload parts, but a real machinist.
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post #3 of 5 Old 03-08-2019, 10:20 PM
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Originally Posted by PMH View Post
Good day,

We have a Kupfer Muhl planer. 600mm bed width (model VUIN 605).
It is ancient (1970's) but works well when its working

The problem I have is that timber started pulling away from the guide (standing behind the machine, the planks "drift" towards the left while feeding), resulting in only the one vertical spindle making a cut, progressively deeper as the timber is fed through...
I've measured the infeed rollers and found the top and bottom rollers to be out of vertical alignment. Weird thing is the plank is drifting TOWARDS the pinching side (is this to be expected?)


My machine was a bit butchered by the previous owners and I don't have a functioning way to adjust the infeed rollers independent of the table, and hence also can't adjust skewing on the roller.

I will appreciate if someone who has working knowledge of this machine can share how this adjustment is normally done on a non-butchered machine - Is this even adjustable at all?

Thank you
PMH
Are you sure you are putting the wood in straight. If the wood is put in a planer angled to the right it will walk left as it feeds through.

If the feed rollers are not level with the table that can also cause wood to feed to one side or the other. If that is what is going on you need to find a way to loosen the pressure on the right or tighten the pressure on the left.

As far as ancient, my planer was made in 1942.
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post #4 of 5 Old 03-09-2019, 01:11 PM
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Originally Posted by PMH View Post
Good day,


I've measured the infeed rollers and found the top and bottom rollers to be out of vertical alignment. Weird thing is the plank is drifting TOWARDS the pinching side (is this to be expected?)

Yes, the higher side will pull the board over, just as a belt will run to the tighter side.

Sorry can't help on how to fix it.

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post #5 of 5 Old 03-10-2019, 03:08 AM Thread Starter
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Thanx for all your replies.
Update: I’ve taken out the bottom feed roller and saw the problem: the roller was designed to rest on linkages that adjusts with the infeed table. However someone “smart” modified this connection by welding static support lugs from the main frame of the machine which now carries the infeed roller. One of these support lugs was busy tearing out which resulted on the RHS of the rolled sagging - hence my problem of boards running skew.

Anyway, I fixed it my adding spacers. All fine now.
Just annoyed by he fact that someone previously took out the linkages which allows adjusting the roller.


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