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How to copy a museum molding?

1/31/17       
Harold Pomeroy

I need to copy existing moldings in a museum. The existing are marble, the new ones will be wood. I can't get end tracings on three of them. I would usually make a casting, as has been discussed here in the past (Bondo, plaster of paris, modeling clay), but I can't risk damaging the existing marble. I would appreciate any ideas.

Once I get a good profile, I can scan and draw it in AutoCad.

Harold Pomeroy

1/31/17       #2: How to copy a museum molding? ...
Marty Member

G'day Harold,
In the past we've cut a very rough template from MDF and then squished it against the profile with a modeling clay using glad wrap to protect feature.
It was like a plasticine but set hard and was available from craft shops.

Good luck

Cheers Marty

1/31/17       #3: How to copy a museum molding? ...
Adam

Personally I would blue tape the marble so I know it will not get damaged. Tape plastic sheeting to everything around it. Make your rough mdf template. Take some of the thicking powder used with epoxy. Mix it into bondo before you add the hardener. Mix it thick like mortar. Do the rest in the typical fashion.

We've had to protect hundreds of things in past while finishing. Never had a problem in the past.

2/1/17       #4: How to copy a museum molding? ...
Ken Member

What about a profile contour gauge?

2/1/17       #5: How to copy a museum molding? ...
james e mcgrew Member

Website: mcgrewwoodwork.com

If you get a clean black line out line it can be converted to dxf for cnc use, or traced to a molder knife

2/1/17       #7: How to copy a museum molding? ...
Chuck Rankin

I have both 6" and 12" long contour guages available.

regards,

Chuck Rankin
Wood Tech Enterprises Inc.
P.O. Box 2226
Fairview, NC 28730

Phone (828) 628-4414


View higher quality, full size image (500 X 498)

2/3/17       #8: How to copy a museum molding? ...
Kevin Member

James, what software do you use for converting a line drawing to dxf? I have been looking for something like this with no luck. Thanks

2/3/17       #9: How to copy a museum molding? ...
james e mcgrew Member

Website: mcgrewwoodwork.com

I am using print2cad i tried several but this one is best for me,, only takes two steps and accuracy is spot on,, i will try and make a youtube vid on using it this weekend

Print2CAD

2/3/17       #10: How to copy a museum molding? ...
james e mcgrew Member

Website: mcgrewwoodwork.com

You can see the accuracy in this pic using my cad measure tool, i cut radius and odd parts real quick this way and the fit is perfect


View higher quality, full size image (964 X 792)

2/3/17       #11: How to copy a museum molding? ...
Mark  Member

Mix your plaster of paris in a large ziplock bag- they're available up to about 3 gallons I think. Burp all the air you can out of it. Then press the whole thing against the molding and hold while it sets.

2/3/17       #12: How to copy a museum molding? ...
Butch Souter

Van Dykes sells a 2 component putty made for replicating parts.
Look up Sil Putty. Its about 40-50 bucks for a pint or so. Mix it up press around part and in 2-3 minutes it is set. Like a hard rubber. they say like 99% dimensional accuracy
Have used it Alot for just that purpose.

2/6/17       #13: How to copy a museum molding? ...
Harold Pomeroy

Thank you for the responses.

Unfortunately, anything that could stain the marble isn't allowed in the museum. It's hard to reverse the process of spilled goo, no matter how good I am at applying it. I have used Bondo for a long time.

I am using radius gauges and steel rulers to measure the moldings, drawing them in AutoCad, cutting them out, and comparing the fit. I needed a set of Starrett radius gauges anyway.

2/16/17       #14: How to copy a museum molding? ...
JimHerron

Perhaps a light, and cast a shadow of the profile onto heavy paper if possible

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