Author Topic: Designing the 1905 Regal  (Read 1440 times)

Offline Dave Otto

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Re: Designing the 1905 Regal
« Reply #30 on: December 30, 2018, 04:54:31 PM »
Looks great Craig.
So the weight is free to slide up and down the shaft to operate the latch? I'm curious what the purpose of the square head set screw is on the weight on the original engine?


Offline Craig DeShong

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Re: Designing the 1905 Regal
« Reply #31 on: December 30, 2018, 10:00:13 PM »
Last post before I put this design away for a while.  Here you see the mixer and muffler designed and installed.  The mixer appears to be of the simple suction variety so that’s how I designed it.

I’ll be putting this design on the shelf for now; I have a newly arrived casting set I’m keen to get started on.  I’m thinking of starting the build for this engine after that engine is complete.  I think Jo stated that you always need to have several projects “In the wings” (If I may paraphrase).

Dave- you ask a good question.  When I observed the engine in operation (and I think you can make it out on the video I give on the preliminary post) the weight was freely sliding up and down the column.  I guess?? You could tighten the set screw and disable the governor??? Why would you want to do that??? Maybe during setup???  I just don’t know.

MJM- There could be a hundred pages involved in explaining the thought processes going into this model. 
I took many photos and measurements of the full size.  These helped me in designing the individual parts and getting the scale “more or less” correct. 
3-D design must be an art form.  So much goes into drawing the individual parts.  In a way, how you draw the individual parts makes a huge difference in how much re-work you need to do.  You learn to draw a component, building constraints into the lines on the drawing, so that you can re-size a part and all the non-essential lines will adjust accordingly.  This is a huge boon to productivity because it allows you to rapidly modify a part without redrawing it.  That part will go into sub-assemblies, and the sub-assemblies to other sub-assemblies, till finally the main assembly.  If you’ve done the drawings and constraints correctly, the change you made “shifts up the line” and you have no other adjustments to make. 

For Final assembly, I found myself assembling the sub-assemblies, using the assembly tool to measure the clearances (or lack thereof) and making minor changes to a few key components to get everything to final assemble correctly.  It’s really a great tool for design but hard to explain till you get in there and learn by doing.

Offline MJM460

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Re: Designing the 1905 Regal
« Reply #32 on: December 31, 2018, 04:46:06 AM »
Hi. Craig,

Thanks for the explanation.  It seems a lot of work to start the learning curve, and some extra to put in those constraints, but the payoff clearly comes when you need to modify a part, an inevitable step in design development.

Looking forward to this engine coming to the top of your build list.

The more I learn, the more I find that I still have to learn!