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The Regular Stuff: Chat, Buy, Sell, Off Topic, etc. => General Discussion - Scale Model Gas Engines - Hit & Miss - Throttle Governed - Non-Compression – etc => Topic started by: Adirondack Jack on September 07, 2020, 08:40:41 pm

Title: Line shaft portion of the woodworking shop build for the M91 complete. Mostly out of wood, of course
Post by: Adirondack Jack on September 07, 2020, 08:40:41 pm
The main line shaft and it’s drive wheel, a floating input jack shaft, tensioned by engine positioning, and two hand sewn belts made from 3D printer drive belt material.

The belts I sewed using 4-0 nylon suture needle and thread, after tacking the belt ends together with thick CA.

The pulley wheels are maple, everything else is 1/8 Baltic birch ply. The shafts each run on two ball bearings in pillow blocks made with a scroll saw and fly cutter to do the bearing bores.

I set it up tonight, wedged the intake valve open a crack to keep the engine from pumping fuel, and gave it all a spin by hand. Everything looks happy enough to go forward with a docking “sled” to position the engine and tension the input belt.

As you can see, it’s a true kitchen table project. One of the perks of living solo.

Title: Re: Line shaft portion of the woodworking shop build for the M91 complete. Mostly out of wood, of co
Post by: St Paul Steam on September 07, 2020, 11:22:53 pm
Very nicely done there , good craftsmanship exuding from that functional and beautiful pulley system.😊
Title: Re: Line shaft portion of the woodworking shop build for the M91 complete. Mostly out of wood, of co
Post by: Adirondack Jack on September 07, 2020, 11:29:00 pm
Just don’t look too close at the drive hub on the engine. I roughed it out with a slight taper, and left it rough as a cob because it’s only 1inch diameter, and it was either allow grip or add tension. I chose grip. Grin.
Title: Re: Line shaft portion of the woodworking shop build for the M91 complete. Mostly out of wood, of co
Post by: Steam Technology on September 08, 2020, 01:14:24 am
All looks fine to me, a wonderful idea to load the engine up.
Title: Re: Line shaft portion of the woodworking shop build for the M91 complete. Mostly out of wood, of co
Post by: Adirondack Jack on September 08, 2020, 01:42:26 am
All my life I’ve been interested in old things or models of old things. The only condition? They must function.  When I rescued a nearly 150 year old rifle that had been in a museum for fifty years, I shot it, and sold it to a guy who took a bison with it.  I have no use for wall hangers.  The engine has to do work. That’s what they’re created for.
Title: Re: Line shaft portion of the woodworking shop build for the M91 complete. Mostly out of wood, of co
Post by: Steam Technology on September 08, 2020, 06:32:28 am
Yes I agree that engines should have work to do.