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Chatter on side profile cutter

1/4/14       
CD Member

I run a Weinig Hydromat with 10 heads. We use it to mill flooring, with our profile heads being opposing.

We are getting a chatter along the side profile cut. It is typically the same on either side, comes and goes, and is generally more severe on the ends (both leading and trailing) than in the center, though it can appear along the entire length.

So far we have checked all the basic setups, heads setting, insert weights, outside fences and hold downs, air pressure to the outside hold downs. We also realigned the back fence and it is straight within 0.001 from one to the next. (We use a 6' straight edge to do that so we can view 6' at a time.)

We recently changed out the groove spindle with one that Weinig inspected and repaired. We will send the tongue spindle out to be done.

Nothing seems to make an impact on this and we have tried much trial and error with trying hold downs and fences at different positions to create a worse/better scenario.

Any ideas?

1/4/14       #2: Chatter on side profile cutter ...
Adam West  Member

Website: http://www.surfprepsanding.com

Normally I would look at your hold down of the part closer, but it appears you have already done this.

Do the parts showing the most chatter have warp in them? Are they raw material going in?

The issue may be starting at the first and second heads. If the parts are warped and you are not holding them down tight the warp will push up into the heads as they cut and the part will be thinner on the leading and trailing ends. This means that the hold down pressure will taper off a both ends and you will get chatter.
Carefully measure the thickness of your stock after it passes through the machine to see if your thickness is remaining consistent.

1/5/14       #3: Chatter on side profile cutter ...
Russ

Website: http://www.mirror-reflections.com

Well it seems you have a great deal of experience on this machine. You have mentioned all the obvious things that could escape the troubleshooting process.
Here are a few things that might help, check the belt tension on both vertical spindles, also check the belts for foreign objects lodged in the belt themselves. The other thing that comes to mind check the casting for cracks that hold the spindle, have you had any major accident involving these spindles? Also check the axial collars for cracks of breakage.
That's my 2 cents,
You might also contact Weinig tech support and or Dave Rankin, (this forum's moderator) he will usually check this forum for special problems he can assist on.
Good luck
Russ @ MR

1/6/14       #4: Chatter on side profile cutter ...
Chuck Rankin

Hi CD:

Here's a basic check sheet with Chatter Mark causes for various head positions. Hope this helps.

Chatter on Right Head

Fences Not Properly Aligned
Knife Not in Line With Outfeed Fence
Improper Holddown at the Head

Chatter on Left Head

Fence Guide After Left Head Not Holding or May Be Out of Parallel
ChipBreaker Too Tight or Too Loose
Fences Not Properly Aligned

Chatter Marks In General

Bad Bearings
Hopper Feed Pushing With Too Much Pressure
Belt Tensions Improper (Normally Too Tight)
Feed Rollers Not All the Same Diameter
Tooling Out Of Balance

Best Regards,

Chuck Rankin
Wood Tech Enterprises, Inc.

P.O. Box 2226
Fairview, NC 28730 USA
Phone: 828-628-4414
Fax: 828-628-4490
www.woodtechtooling.com

1/6/14       #5: Chatter on side profile cutter ...
CD Member

Thanks for the helpful responses!

We will definitely take a look at the things you guys provided.

A cracked housing is something that I had in the back of my mind, but I am concerned about evening being able to find the crack. Would it be pretty noticeable?

1/6/14       #6: Chatter on side profile cutter ...
Russ

Website: http://www.mirror-reflections.com

I would not put too much emphasis on a cracked housing unless you had a major accident with the cutter heads, maybe the the radial locking mechanism is something to look at also.
You would have to get underneath the machine with a light and look and feel the casting for deformities.
I would probably be more inclined to follow Chucks recommendations first, but it seems as though you have gone thru the basics already.
Tough to diagnose on a blog posting without being there.

1/6/14       #7: Chatter on side profile cutter ...
Russ

What about the in feed fence when positioned at "0" position, is it parallel to the rest of the fences? That might be something tat was missed.

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