Recent Posts

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Boilers / Re: Boiler for Marcher engine
« Last post by Moxis on Today at 04:10:43 PM »
Thank you George! For sure I will contact them and ask for a quotation. Because I agree with you that fabrication of a boiler might be beyond my skills and equipment, and it will be more on a safe side just to buy one.
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From Kits/Castings / Re: Marcher, a twin cylinder marine steam engine
« Last post by Moxis on Today at 04:06:50 PM »
Thank you all for watching my build and having equal opinion about painting the machine. I am being struggling a lot to have proper fittings made to connect my air compressor into inlet piping of Marcher. So far I have only tested the machine just blowing compressed air into the inlet tube with a hand held air gun. And have noticed that in the beginning self starting of the engine was a bit difficult, but after a lot of oil and turning the engine in the lathe for a while it begins to rotate more and more easily producing a lot of black oil. So I am sure that after a couple of days I am ready to publish a video about the running of this little workhorse.
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From Kits/Castings / Re: Textile Mill Diorama
« Last post by J.L. on Today at 03:35:31 PM »
Thank you Thomas for these two historically significant photographs of early belt driven machinery. It's nice to see this drill press still in use driven by an electric motor.

Speaking of historical issues, I have been using PMR socket headed grub screws on scale models of machines that were in producction well before the turn of the century. Actually the hex headed socket didn't come into production until about 1910.

I atone here with a hex headed bolt on the lathe's crank. I'm not sure, but maybe this is where the slot headed grub screw was in use. It would certaiinly clear the boss's surface when tightened than a hex headed bolt sticking out.

In this situation, the bolt head runs free and clear at the end of a shaft.
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Vehicles & Models / Re: Chris's Marion 91 Steam Shovel
« Last post by crueby on Today at 03:11:42 PM »
Hi Chris, I did a quick calculation for shear force to strip #1-72 brass screws. The shear /strip force could be 25.2 to 62.9 lb depending on hardness of the brass and the brass grade. Take these figures with a grain of salt though - they are based on the theoretical full thread area, but in real life the thread area is probably not 100% of theoretical perfect, nor will the tapped hole be.

Even at the low number 25 .2 lb per screw I doubt that the screws in your eccentrics would ever see 25.2 lb load each. The friction load on your small area valve in the engine is probably only a few pounds and the eccentric being a cam will ease the load application on the screws. They aren't loaded like say conrod bolts would be.

The 932 bronze will be considerably higher strength than the brass screws, so the screws would likely strip (if anything is going to) before the bronze strap thread. You could use replacement mild steel or stainless screws if you ever did strip the brass ones.

Just food for thought. I think the brass #1-72 screws will be fine, and if not, you could substitute mild steel or stainless ones and they would be more than enough. Don't overtighten the screws though. Snug and loctite blue will do.
Great to know, thanks!!  Being so narrow, I figured the bronze for the straps would be better than brass, but was worried that the screws in brass would be too weak.

How do you calculate shear and thread strip forces for diff sizes/metals? Is there a formula set for that?
 :cheers:
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Vehicles & Models / Re: Chris's Marion 91 Steam Shovel
« Last post by cnr6400 on Today at 03:00:54 PM »
Hi Chris, I did a quick calculation for shear force to strip #1-72 brass screws. The shear /strip force could be 25.2 to 62.9 lb depending on hardness of the brass and the brass grade. Take these figures with a grain of salt though - they are based on the theoretical full thread area, but in real life the thread area is probably not 100% of theoretical perfect, nor will the tapped hole be.

Even at the low number 25 .2 lb per screw I doubt that the screws in your eccentrics would ever see 25.2 lb load each. The friction load on your small area valve in the engine is probably only a few pounds and the eccentric being a cam will ease the load application on the screws. They aren't loaded like say conrod bolts would be.

The 932 bronze will be considerably higher strength than the brass screws, so the screws would likely strip (if anything is going to) before the bronze strap thread. You could use replacement mild steel or stainless screws if you ever did strip the brass ones.

Just food for thought. I think the brass #1-72 screws will be fine, and if not, you could substitute mild steel or stainless ones and they would be more than enough. Don't overtighten the screws though. Snug and loctite blue will do.
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From Kits/Castings / Re: Textile Mill Diorama
« Last post by Ye-Ole Steam Dude on Today at 02:41:37 PM »
Hello JL,

Attached are two photos of a large Old Belt Driven Drill Press that are in my friend's shop and still in use today. Mr. Pete (the father) purchased this back in the early 50's from a old shop in Beaumont, Texas that was going out of business. As you can see, he adapted an electric motor to it and the only repair has been a recent shorting of the belt completed by his son who is now running the shop.

Have a great day,
Thomas
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From Kits/Castings / Re: Textile Mill Diorama
« Last post by J.L. on Today at 02:18:27 PM »
Interesting discussion gentlemen.

Don, perhaps hand forging the square headed bolt was the goal for the test. I know that hot and cold rolled steel as well as drop forging was well under way at the turn of the century. I agaree with the fellows that find the hex headed bolts in wide use at that time.

Here is a quick look at the wood lathe being roughly set up. I am flying rather fast and loose with this kit, as much of it will not be made. Some parts will be simply be glued together!

I do like the desisgn of the large flywheel with its serpentine spokes.
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Engines / Re: Radial Engine Project
« Last post by toolznthings on Today at 01:39:47 PM »
Good running engine and some beautiful machining. Does anyone know the source of the drawings? Steve

Scott Labombard from Flushing Michigan. He used to come to the names show but I have not seen him in about 5 years.

Internet search brings up the only Scott in Flushing Says age 53 which is about right.

Try (810) 487-0215

Wife Amy has a facebook page but you need to log on to contact. I am not a facebook member.

I have a snail mail address if all else fails.

I wouldn't mind seeing a different set of plans myself. If anyone finds out about Scott's plans please post. You don't want the plans I have.  :insane:
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Engines / Re: Radial Engine Project
« Last post by stevehuckss396 on Today at 01:09:49 PM »
Good running engine and some beautiful machining. Does anyone know the source of the drawings? Steve

Scott Labombard from Flushing Michigan. He used to come to the names show but I have not seen him in about 5 years.

Internet search brings up the only Scott in Flushing Says age 53 which is about right.

Try (810) 487-0215

Wife Amy has a facebook page but you need to log on to contact. I am not a facebook member.

I have a snail mail address if all else fails.


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Engines / Re: Radial Engine Project
« Last post by yogi on Today at 12:38:05 PM »
Beautiful engine Brian!  :ThumbsUp: :ThumbsUp: :ThumbsUp:
I like the wood stand. It goes well with the engine. Very classy!  8)
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