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General control line discussion => Open Forum => Topic started by: Larry Fernandez on January 28, 2012, 04:58:16 PM

Title: Engine Turning/ Jewelling?
Post by: Larry Fernandez on January 28, 2012, 04:58:16 PM
I know this was posted on the other board so bare with me.

I am not sure what the process is called, but you might recognize it on the front of Lindberg's Spirit of St. Louis.
Is there anybody out there that can replicate this effect on an aluminum landing gear for my Thunderbird.(for a small fee of coarse).

Larry, Buttafucco Stunt Team
Title: Re: Engine Turning/ Jewelling?
Post by: Bill Little on January 28, 2012, 05:04:08 PM
I know this was posted on the other board so bare with me.

I am not sure what the process is called, but you might recognize it on the front of Lindberg's Spirit of St. Louis.
Is there anybody out there that can replicate this effect on an aluminum landing gear for my Thunderbird.(for a small fee of coarse).

Larry, Buttafucco Stunt Team

Hi Larry!

Strange, but you are going to do the same thing I did for MY T-Bird!

I used a dowel in my drill press the end coated with some polishing compound.  Just take it real slowly at first to get the pattern right.  I used the corse, black compound.

BIG Bear
RNMM/AMM
Title: Re: Engine Turning/ Jewelling?
Post by: jim ivey on January 28, 2012, 05:15:36 PM
pencil eracer.    try it
Title: Re: Engine Turning/ Jewelling?
Post by: Dick Pacini on January 28, 2012, 05:19:28 PM
It is called burnishing.  The dowel in the drill press is effective.
Title: Re: Engine Turning/ Jewelling?
Post by: James Mills on January 28, 2012, 05:21:09 PM
pencil eracer.    try it
DITTO, a guy who used to live in our area used the pencil eraser in his drill press, nice effect.

James
Title: Re: Engine Turning/ Jewelling?
Post by: Lauri Malila on January 28, 2012, 05:27:17 PM
Hi.

It's not called engine turning, engine turning is one kind of engraving (Guilloche) made with a very complicated machine dedicated to this kind of work. The correct word is spotting, pérlage in French. It's an abrasive method. It used to be made with a revolving tool made of wood or ivory, charged with abrasive paste or powder, nowadays we make it with abrasive-impregnated rubber sticks. If you need the tools, I can help. L
Title: Re: Engine Turning/ Jewelling?
Post by: Joe Messinger on January 28, 2012, 06:48:49 PM
Well, it is correctly referred to as engine turning and/or jeweling in the gun world.  It's used mainly on bolt bodies but also on other surfaces on guns.  Jeweling isn't just for appearance sake.  It helps reduce surface friction making the action smoother.

Different tools are used.  Some have a rubber tip (like a pencil eraser) and some are round, wire brushes.  An abrasive such as valve grinding compound is used on steel surfaces.  A mixture of heavy grease and pumice works well.  Jeweling on aluminum wouldn't require much, if any added abrasive.

The swirls should overlap each other by one-third and should be in a straight line.  Hard to do by hand (electric drill).  A drill press with a vice to hold the workpiece that can be indexed is best.

Joe
Title: Re: Engine Turning/ Jewelling?
Post by: jim ivey on January 28, 2012, 08:47:23 PM
Its a lot of work and wears off easy. use a fine "cratex stick for thr best results . sorry i didn;nt remember sooner,  oldtimers n~ HB~> jim
Title: Re: Engine Turning/ Jewelling?
Post by: Rollin Keszler on January 28, 2012, 11:19:10 PM
This instructional video explains the process:http://www.eaavideo.org/video.aspx?v=595068183001 (http://www.eaavideo.org/video.aspx?v=595068183001)
Hope this helps.

Title: Re: Engine Turning/ Jewelling?
Post by: Dallas Hanna on January 29, 2012, 03:05:44 AM
Hi.

It's not called engine turning, engine turning is one kind of engraving (Guilloche) made with a very complicated machine dedicated to this kind of work. The correct word is spotting, pérlage in French. It's an abrasive method. It used to be made with a revolving tool made of wood or ivory, charged with abrasive paste or powder, nowadays we make it with abrasive-impregnated rubber sticks. If you need the tools, I can help. L

Yep!  http://en.wikipedia.org/wiki/Guilloch%C3%A9    But it was someone over your way who called the simplified way we do it also as "engine turned" finish. :!

When I was shown how to get the finish back around 1962 it seemed to be known as "mottling" or "spotting".

Regardless of terminology, the piece of dowel in the drill press combined with some sort of abrasive paste works very well.

HH
Title: Re: Engine Turning/ Jewelling?
Post by: Lauri Malila on January 29, 2012, 07:28:52 AM

 Ok, it seems to be commonly called engine turning. But still, I think it's wrong:) Our company is one of the few left who still master the art of real engine turning, and having seen and tried that I cannot remain quiet with this. L
Title: Re: Engine Turning/ Jewelling?
Post by: jim ivey on January 29, 2012, 05:18:59 PM
heres what ya need.   jim  Cratex - Rubberized Abrasives Catalog - Blocks & Sticks
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Title: Re: Engine Turning/ Jewelling?
Post by: Larry Fernandez on January 29, 2012, 07:31:47 PM
heres what ya need.   jim 

Thanks a bunch Jim.
Now I just need to fab up a jig, indexed to properly space each pass.
Thanks to all for your help and info.

Larry, Buttafucco Stunt Team
Title: Re: Engine Turning/ Jewelling?
Post by: jim ivey on January 29, 2012, 07:43:18 PM
actually you can hold it in your hand snd eyeball it Iv'e done a few times. "cratex"  works fast, watch out!!
Title: Re: Engine Turning/ Jewelling?
Post by: Bill Little on January 30, 2012, 02:00:19 PM
I did mine by eyeball on the drill press.  Take a scrap of aluminum and do a wee bit of practice and you will see how easy it is.  It just takes a long time to do a LG.

From looking at Bob Palmer's WC model hanging in Muncie, I am very sure he did his by "hand".

BIG Bear
RNMM/AMM