Lobaugh Berkshire
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Re: Lobaugh Berkshire
Jack Raymus made acceptable sides. I have yet to solder my Raymus E-7, but will look into making masters this summer.
The secret has to be those bats with rivets. I am open to suggestions, since I have very little experience with making things in plastic. Is it still possible to buy plastic rivet strips?
The other area of concern is the air intake windows - fill them with a screen, or leave open? Metal might flow better if the openings are partially filled.
I could just use Jack's sides as the master, but I hate to let them out of my sight. And I suppose I could use sides from Sunset, if the bare body was available. The Erie-built plastic will cost around $50 total, and a good bit of that is shipping!
The secret has to be those bats with rivets. I am open to suggestions, since I have very little experience with making things in plastic. Is it still possible to buy plastic rivet strips?
The other area of concern is the air intake windows - fill them with a screen, or leave open? Metal might flow better if the openings are partially filled.
I could just use Jack's sides as the master, but I hate to let them out of my sight. And I suppose I could use sides from Sunset, if the bare body was available. The Erie-built plastic will cost around $50 total, and a good bit of that is shipping!
- John Webster
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Re: Lobaugh Berkshire
Acetal comes in many different versions. Google Celcon and Delrin for lots of manufacturer's data sheets on properties and molding procedures.
What might be important to this discussion is that unfilled acetal shrinks during the molding process at .018-.020 inch per inch while 25% glass fiber filled acetal shrinks at .008-.010 inch per inch in the direction of flow and slightly higher across the direction of flow. If someone is shooting unfilled acetal into molds designed for glass filled acetal they will get undersized parts.
If someone has a set of masters that they really like it might be worthwhile to shop around at the many 3D printing shops available. Some of them can scan the masters giving them 3D models of the parts. Those models can then be printed in many materials from ABS plastic to stainless steel. There are some shops that can resize the 3D models and print plastic molds from them that can be used for short run injection molding in low temperature materials like styrene.
What might be important to this discussion is that unfilled acetal shrinks during the molding process at .018-.020 inch per inch while 25% glass fiber filled acetal shrinks at .008-.010 inch per inch in the direction of flow and slightly higher across the direction of flow. If someone is shooting unfilled acetal into molds designed for glass filled acetal they will get undersized parts.
If someone has a set of masters that they really like it might be worthwhile to shop around at the many 3D printing shops available. Some of them can scan the masters giving them 3D models of the parts. Those models can then be printed in many materials from ABS plastic to stainless steel. There are some shops that can resize the 3D models and print plastic molds from them that can be used for short run injection molding in low temperature materials like styrene.
You begin flying with a full bag of luck and an empty bag for experience. The object is to fill the bag of experience before you empty the bag of luck.
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Re: Lobaugh Berkshire
I bet it is important. The NWSL product is usable as-is, but that glas-filled box fits a lot better without special trimming.
The market is so small it may not be worth it for them to look for a shop that can shoot the glass-filled parts. They seem to be really good folks - I hope they can keep on keeping on.
The market is so small it may not be worth it for them to look for a shop that can shoot the glass-filled parts. They seem to be really good folks - I hope they can keep on keeping on.
Re: Lobaugh Berkshire
bob turner wrote:Is it still possible to buy plastic rivet strips?
Archer produces rivet decals made with resin.
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Re: Lobaugh Berkshire
Bob,
Your package arrived in excellent condition. I'll try to deal with it tomorrow.
Jay
Your package arrived in excellent condition. I'll try to deal with it tomorrow.
Jay
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Re: Lobaugh Berkshire
No hurry at all. The sides are not even ready to ship yet. Waiting for Atlas to ship four more grilles.
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Re: Lobaugh Berkshire
rex desilets wrote:As I recall, Bob Hundman started as a draftsman for Model Railroader and then went out on his own. He was cook and bottle washer for the magazine for all its years, which eventually overcame him.
My recollection is that the acquisition of CTC Board magazine (wikipedia) was a disaster for Hundmann's company.
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Re: Lobaugh Berkshire
Well, BUMP! My friend Greg just told me about the Bartig collection, and gave me permission to post his photos of the Bartig MoPac Berk. Greg reminded me - we met in Denver many years ago, and he wanted to know about my MoPac. I had copied Hal Sharkey's, using the above-mentioned MM drawings. Greg is a world-class modeler himself, and does detail work that rivals that done by Bartig.
Greg is a pilot as well - he was flying for UPS when I met him, but he flew the Gooney Bird (C-47) in Vietnam. I wouldn't mind doing a couple landings in one of those. Biggest taildragger I ever flew was the Stinson Reliant.
Now, let me see if I can transfer a couple images for you:
Greg is a pilot as well - he was flying for UPS when I met him, but he flew the Gooney Bird (C-47) in Vietnam. I wouldn't mind doing a couple landings in one of those. Biggest taildragger I ever flew was the Stinson Reliant.
Now, let me see if I can transfer a couple images for you:
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Re: Lobaugh Berkshire
Wow, huh? With permission, so don't duplicate these on other public forums?
In Pete's words, WOW! WOW! WOW!
In Pete's words, WOW! WOW! WOW!
Re: Lobaugh Berkshire
WOW! WOW! Very nice!
Dan Weinhold
Dan Weinhold
- John Webster
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Re: Lobaugh Berkshire
A work of art. Thanks for sharing.
You begin flying with a full bag of luck and an empty bag for experience. The object is to fill the bag of experience before you empty the bag of luck.
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Re: Lobaugh Berkshire
Here are my latest attempts at Lobaugh Berks. The one on the left is an IGN/MoPac (with an SP Tender?). The one on the right is my impression of what the SP would have done with a CNW Berk. I have two lifting injectors on it and a giant BL feedwater heater - not sure there is a prototype for that.
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Re: Lobaugh Berkshire
I like it, the one on the right.
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Re: Lobaugh Berkshire
These are coming along. The IGN needs an ashpan pretty badly. I am down to visors, marker lights, and front running boards - and maybe a new reverser for the SP.
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