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Message Thread:

Veneering a Cylinder

10/23/17       
Wood Dust

Hey all, leaning on the group for help coming up with a way to veneer a cylinder.

What the end result needs to be is a 48'' round cylinder that is 42'' tall. What I have made thus far is two halves that will get pushed together once veneered. I have done smaller versions of this before but nothing of this size. I am weary of using contact cement, and my vac bag wont take anything this tall and wide.

What would you do or what have you done? Thanks !

10/24/17       #2: Veneering a Cylinder ...
Matt Krig Member

We just order them. http://www.tapeease.com/Wood%20Cylinders.htm

Love an adventure, but lots of specialty companies making things more efficiently than I can.

10/24/17       #3: Veneering a Cylinder ...
B.H. Davis Member

One solution is to use standard Titebond glue in a contact cement sort of application.

You apply regular (red bottle cap) Titebond to both surfaces and let it dry. Then you can bring the surfaces together and use an iron to warm the veneer surface. The heat will soften the Titebond glue and the two layers will bond as it cools. Slowly work your way around the cylinder letting the iron heat and press the two surfaces together.

You'll want to experiment on some scrap first to get the feel but I've done curved projects with this method with good, long term results.

BH Davis

10/24/17       #4: Veneering a Cylinder ...
Kevin Jenness

Outsourcing is a reasonable option. If you are bent on doing it yourself consider bagging your layup outside the form. This is common for large glue-ups like stair stringers.

It sounds as though you have made your semi-cylinders using contact cement. I would not want to rely on that method.

10/24/17       #5: Veneering a Cylinder ...
Wood Dust

Thanks guys,

Matt- I have looked this route but have not found anyone that will or can do this. For one offs I am always on board to source to people who have experience in the needed item.

Bh Davis- I have done a few smaller veneer jobs like this , had good results but I am weary of this too.

10/24/17       #6: Veneering a Cylinder ...
Adam

If you already have the skills and knowledge of vac bagging I would use one.

When bagging big or odd shaped projects you can buy vac bag plastic and use the tape to stick it all together. It works perfectly. That's how we bag big boats(40').

In the shop its also handy for making flat parts. You can make a table from melamine and tape the bag to it.

Jamestown Distributors is an excellent company and resource.

Vac bag tape

10/27/17       #7: Veneering a Cylinder ...
Wood Dust

Adam,

I didnít know I could buy supplies to make my own bag ! Never even thought of it , learn something new everyday ! Thanks

10/27/17       #8: Veneering a Cylinder ...
Adam

Its often easier to make a flat table on a bench or saw horses out of a sheet of melamine. Build your bag 30% bigger than the part. Then use the tape to stick it to the table. It will all suck down. Use the tape to stick your hose to the bag.

You can also use the mastic to fix holes, leaks and to make different length bags out of the tube plastic.

There are all kinds of tricks to using vac bags. One of my favorites is using a shop vac to pull the huge volume of air out of a big boat mold. Once you get most of the air you can switch on the vac pump to suck it down.

10/27/17       #9: Veneering a Cylinder ...
B.H. Davis Member

Making your own bag is a great idea. However making a frame table can be a problem if you have a strong enough vacuum.

A bag will press evenly from all sides. A frame table (panel on the bottom, bag material on top) can easily crush the parts being pressed.

As an experiment I once put a joint compound bucket with a piece of 3/4" particle board on top of the open end onto the frame table. When the vacuum was activated the pressure punched a hole in the particle board right down into the bucket.

If you go this route you will need to build a ribbed support form for the half cylinder. It is much easier in the long run just to make the oversized bag.

BH Davis

10/27/17       #10: Veneering a Cylinder ...
Kevin Jenness

Wood Dust,

As B.H. suggests, you can do this with a large home-made bag and no form, just omit the table or platen. Lay up the veneer on your semi cylinder with some breather fabric and pull a vacuum. Or follow his original direction and use reactivated Titebond with an iron, although that would not be my first choice. Hammer veneering would be another option.

The one thing I would be concerned about is your substrate. Your initial post suggests that you may have made your half cylinders with contact cement, which gives me pause. How did you make them? Kerf Kore or similar?

Once the half cylinders are veneered, you need to true up the mating edges, probably with a router and straightedge, index the outer surfaces with splines (dowels, dominoes etc.) and join the cylinder halves with strap clamps.

It would be useful to know how your elapsed time when complete compares to a quote from a specialist (http://www.kellerwoodproducts.com/high_pressure_laminate_hpl_veneered_consoles.ph
p, for example). Also, how true a cylinder you wind up with.

10/27/17       #11: Veneering a Cylinder ...
Adam

Sorry for the misunderstanding. I wasn't suggesting using a vac table for a cylinder. It would crush it in some manner as BH mentioned.

I was mentioning the other benefits of using the sheet/tape method.

10/27/17       #12: Veneering a Cylinder ...
B.H. Davis Member

Adam,

No..........you were quite clear. I'm the one that didn't read it carefully enough.

BH Davis

10/28/17       #13: Veneering a Cylinder ...
Wood Dust

Thanks all, Iíll keep you posted how it turns out.

Kevin , believe me I would of loved to of bought this in already done . Keller wood products wouldnít do it . Said it was to big and werenít willing to Do it . I found a supplier that could sell me the half cylinders , Roberts Plywood in ny.

10/28/17       #14: Veneering a Cylinder ...
Kevin Jenness

What are you going to do with these gargantuan tubes?

I found a reference to Shapes Unlimited which claims to stock up to 48" diameter tubes made of fiberboard. That might be worth checking out if you do any future similar projects.

It would be interesting to hear how this project turns out for you.

10/28/17       #15: Veneering a Cylinder ...
Adam

wood dust,

What's your plan on connecting the two halves? I'd be interested to see how they have distorted.

10/29/17       #16: Veneering a Cylinder ...
Wood Dust

Once completed these get solid wood end grain top and ties together two long marble slabs .its for a commercial job, Iím not concerned with the distortion because I am going to Cnc half circles to pull the half columns back to shape. And as for the joint, should end up fairly seamless as itís rift oak running vertically, custom 8íx4í sheets

10/29/17       #17: Veneering a Cylinder ...
B.H. Davis Member

When we do this type of thing in the shop we bring the two halve cylinders together into a full circle. Then we take it to the table saw and rip it in half. That is for a 48" high cylinder we would end up with two 24" high cylinders.

Then we edge glue the two back together while rotating one 90 degrees. This locks it in as a near perfect circle.

Admittedly we do this with maybe up to 24" tall cylindrical jambs so the two halves are less wide than in your case. At 48" tall I'd be tempted to rip it into 3 sections.

BH Davis

11/1/17       #18: Veneering a Cylinder ...
Paul Downs

Try Northcreek Woodworks. They do a lot of cylinders.

11/7/17       #19: Veneering a Cylinder ...
Jim Baldwin

Sometimes old ways work best.

I would use hot hide-glue and a drywall trowel.

Buy the beating apparatus, follow directions and apply veneer like pasteing wallpaper.
If it doesn't come out perfectly, you reheat, remove and try again.

No pressing required, just complete contact.
Hide-glue is amazing stuff!

 

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