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Production box miter cutting

7/15/16       
Ian Hawthorne Member

Website: http://www.ianhawthorne.com

Hi Folks

I am looking for a quick and accurate way to produce miters for production runs of jewellery boxes that will be made from veneered MDF? I have tried the tablesaw with ok results but can be time consumming to setup each time and also means the saw is then tied up with this job.

Thanks Ian

7/15/16       #2: Production box miter cutting ...
rich c.

Look for miter fold/V-groover machinery.

7/15/16       #3: Production box miter cutting ...
rich c.

Look for miter fold/V-groover machinery.

7/15/16       #4: Production box miter cutting ...
Dustin orth

Website: http://customwoodmontrose.com

Have you tried using a shaper? I have a tilting shaper that I do miters on, works way better than any table saw. Normally I do longer pieces with a power feed but you could do shorter with either a sled or sliding table.

7/16/16       #5: Production box miter cutting ...
Ian Hawthorne Member

Thanks for the replies - the miter fold machine looks great but I have limited space and these look big! might try some mitre fold tests with a bit and my milling machine, slow but if the results are good then perhaps a CNC router.

Ian

7/16/16       #6: Production box miter cutting ...
David R Sochar

Guillotine. Foot operated, often used for clean, very accurate miters for picture frames and glass stops. Quiet, smooth and fast with a mitered length guage for repeat cuts.

I just happen to have a like new Morso that I am trying to sell.....

7/16/16       #7: Production box miter cutting ...
Joel

A well tuned radial armsaw with an appropriate blade and a stop would make short work of this. Don't expect to throw a GP blade on a $50 craftsman saw and get good results though. Nothing wrong with craftsman they just need tuning.

7/17/16       #8: Production box miter cutting ...
Larry

Cutting miter folds with a Vee bit isn't the greatest if that's what you are considering one a CNC router. The point has not cutting action and just plows. If you get a router for this job you will want a tiling aggregate so the bit is cutting over it's entire area. A straight bit held at 45 degrees. The router offers the same advantages as the miter fold machine in that the reference surface of the machine and panel is the same.
I've done miter folds on the router with the V bit, but the veneer wants to fracture at the very place where you want it perfect. Ideally, you put the tape on before cutting.

7/18/16       #9: Production box miter cutting ...
Ian Hawthorne Member

I produced some test cuts with a miter fold bit using my milling machine and with the depth set to 0.1mm about the spoil board it work very well! ok slow to produce on a mill but with a CNC it should work well>

Thanks Ian

7/18/16       #10: Production box miter cutting ...
Pat Gilbert

"but with a CNC it should work well"

No it won't, reread Larry's post.

7/18/16       #11: Production box miter cutting ...
Ian Hawthorne Member

"No it won't, reread Larry's post."

I understand his post but can you explain why it worked on a milling machine?

7/18/16       #12: Production box miter cutting ...
Pat Gilbert

Because you did not do enough to dull the point. Which is basically pushing the material out of the way at the point.

7/18/16       #13: Production box miter cutting ...
Ian Hawthorne Member

Ok understood - but how about a long life PCD insert surely that would keep its edge longer?

7/18/16       #14: Production box miter cutting ...
Pat Gilbert

No, the problem is still the same, the circumference of the router bit at the point is zero.

7/18/16       #15: Production box miter cutting ...
Ian Hawthorne Member

Ok so either replace the tips every so many or go through to the spoil board by a few mm keeping the tip out of the work. Of course this means it has to be taped after but no a big problem.

7/18/16       #16: Production box miter cutting ...
Pat Gilbert

The problem is glue squeeze out on the face.

There is this, don't know anything about it.

Possible Alternative

7/18/16       #17: Production box miter cutting ...
Ian Hawthorne Member

Squeeze out won't be a problem as I have eliminated it with the method I use. The saw blade looks good but could be a year before it goes to market.

7/18/16       #18: Production box miter cutting ...
Joel

Am I reading this right? You have some jewelry boxes to build and you got out the Bridgeport? I don't get it. Is your chopsaw busted?

7/18/16       #19: Production box miter cutting ...
Ian Hawthorne Member

"I don't get it. Is your chopsaw busted?"

I would be keen to see how you fit a miter fold bit to a chopsaw!!

7/18/16       #20: Production box miter cutting ...
Pat Gilbert

I wonder if you could build a fixture for doing this vertically, so you could use a V tipped saw blade on your Bridgeport?

Ok I'm not going to think about this anymore it is your problem.

7/18/16       #21: Production box miter cutting ...
Joel

Cut 45 degree angles, put a piece of packing tape on the face of the seam, apply glue. Done! Never seen one fail.

7/18/16       #22: Production box miter cutting ...
Kevin Jenness

Many years ago there was a Fine Woodworking article on this subject in which the author used a beefed up radial arm saw (the guide arm was braced with 45's to the table) with a custom 45 degree groover to produce electronic instrument cases. He cut not quite through the veneer and reinforced the back with tape before folding up the boxes. If you have room that would be an effective solution that you could leave set up. A good stop system would be necessary.

For infrequent short runs and limited space I would stick with the tablesaw or shaper.

7/18/16       #23: Production box miter cutting ...
Pat Gilbert

"the guide arm was braced with 45's to the table"

What does that mean?

7/18/16       #24: Production box miter cutting ...
Kevin Jenness

That means the the front end of the overhead arm of the saw was braced by a pair of stout steel angles welded or bolted to the base in order to hold it in a fixed position with no flex. It was a serious setup, not an amateur affair. If I can find the article I will post the particulars.

7/19/16       #25: Production box miter cutting ...
Kevin Jenness

"Radial Saw Meets Computer", Fine Woodworking #40 pp.98-9. The machine was set up with a moving vacuum table controlled by a computer to locate the v-grooves and a hydraulic/pneumatic system to move the saw head. Very similar to a cnc with an aggregate head but less versatile. Worth a look if you can locate a copy of the May/June 1983 issue- it doesn't seem to be available online.

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