Dados and Tenons tight!

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Terry Davis
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Dados and Tenons tight!

Postby Terry Davis » Tue, Jan 06 2009, 4:38PM

Over the past few jobs our dados and tenons have gotten very tight, to the point we had to use clamps to pull them together. We have changed no setting in Ecabs, what settings at the machine would effect this?

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Re: Dados and Tenons tight!

Postby David Egnoski » Tue, Jan 06 2009, 5:33PM

Are you checking material thickness on several sheets before cutting? I've seen pretty big differences in thickness in one unit lately.
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Re: Dados and Tenons tight!

Postby Damon Nabors » Tue, Jan 06 2009, 6:24PM

adjust your fit clearance
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Re: Dados and Tenons tight!

Postby jerry johnson » Tue, Jan 06 2009, 8:14PM

Have you sharpened your bits? When you sharpen them they get smaller and you need to update your tool table. 8)

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Re: Dados and Tenons tight!

Postby Damon Nabors » Tue, Jan 06 2009, 8:52PM

True
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Jon Dieterlen
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Re: Dados and Tenons tight!

Postby Jon Dieterlen » Tue, Jan 06 2009, 10:12PM

When tools get dull, they compress the wood fibers instead of cutting them. After the cut is made, the fibers spring back. Thus dadoes end up slightly smaller, and tongues slightly wider.

My hunch is, you need to sharpen the tooling.

Hope this was helpful.

Jon

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Jody Wilmes
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Re: Dados and Tenons tight!

Postby Jody Wilmes » Wed, Jan 07 2009, 9:07AM

Your daylight value could be wrong, making the tennon too thick or too thin. Check your wasteboard value too.

Double check your diameter set for the tool cutting the dado. As mentioned earlier, tool wear would cause the dado width to become too small.
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Re: Dados and Tenons tight!

Postby Bill Madge » Wed, Jan 07 2009, 9:58AM

Check Controll nesting to make sure that you are set to conventional cut direction, climb cutting will cause diflction in the bit. This problem compounds as the bit becomes Dull. Second check your cut through, if it seems that your cut through doesn't quite match what you have set in controll nesting there may be an issue with your measuring device. I have had a similar problem and discovered that the arm on the measuring system was slightly off square to the machine, this may only affect your surfacing cutter because of it's large diameter and it being three wings. If you measure the surfacer multiple times turning it slightly between measurements you should see the daylight values change. Thickness of material will not affect the fit of the tennon as everything is referanced from the table.

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Re: Dados and Tenons tight!

Postby FredHirsch » Wed, Jan 07 2009, 1:11PM

Terry,
All these are great suggestions. I think it could be any or all of the above. For this exact reason we don't use re-sharpened bits on the machine anymore. I've had the pleasure of sending out a bunch of KD furniture that the guys cut with resharpened bits and did not reset on machine. The phone rang off the hook for a couple days... and we learned our lesson very quickly. Keep your tooling sharp, we've learned it is not worth the cost and hassle with assembly and all the other problems that will ripple through the system.
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Re: Dados and Tenons tight!

Postby Joe Dusel » Fri, Jan 09 2009, 11:10AM

Yeah, having RTA holes cut slightly small with re-sharpened bits is not good. That happened on a job done for me with $120/sheet plywood. Fortunately it was a small job and we were able to correct the problem the old fashioned way with a hand drill.

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Re: Dados and Tenons tight!

Postby JohnLashuay » Fri, Jan 09 2009, 11:16AM

When you sharpen your bits can you measure the bit and input the reduced size of the bit and it will in turn CNC the proper size?
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Re: Dados and Tenons tight!

Postby Todd Miller » Fri, Jan 09 2009, 1:16PM

JohnLashuay wrote:When you sharpen your bits can you measure the bit and input the reduced size of the bit and it will in turn CNC the proper size?


Joshua,
This will only work with programs that use a G41/G42 code to activate the radius comp. When code is generated it is written as a centerline cut. The G42/G41, when called, looks at the tool being used, sees what diameter it is by looking at the tool table, then compensates half the diameter.

HTH

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Re: Dados and Tenons tight!

Postby Terry Davis » Mon, Jan 12 2009, 2:10PM

Problem solved! Jody you nailed it, it was a bad (fat fingers) wasteboard value, everything is cutting perfect again!

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Jody Wilmes
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Re: Dados and Tenons tight!

Postby Jody Wilmes » Mon, Jan 19 2009, 10:42AM

Terry Davis wrote:Problem solved! Jody you nailed it, it was a bad (fat fingers) wasteboard value, everything is cutting perfect again!

Good to Hear!
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