Julius de Waal Simple Horizontal Steam engine for beginners

sarel · Jan 4, 2018

Good day, I am trying build Julius de Waal's Simple Horizontal Steam engine for beginners, my first slide valve engine. However there seems to be some dimensions missing. The drawing is freely available, drawing no. 1CHSE-AM-01. Part 03 Valve Chamber has a couple of length dimensions missing, overall length, distance to 3mm hole from either end. Part number 12 - Slide valve does not have a dimension for the position of the 6.5mm slot.

I would appreciate if someone has the dimensions or has build this engine and could assist.

regards.

Jasonb · Jan 4, 2018

. Deleted...

Cogsy · Jan 4, 2018

sarel said:
Part 03 Valve Chamber has a couple of length dimensions missing, overall length, distance to 3mm hole from either end.

I may be wrong here (it's happened before) but is the overall dimension, or even the placement of the 3mm hole really critical here? I'm assuming that as long as the valve has enough room to complete its travel in each direction then it should function. Of course the distance from the crankshaft to the 3mm hole is critical for timing but that depends on other parts. I'm not a steam guy though, so may well be wrong.

sarel said:
Part number 12 - Slide valve does not have a dimension for the position of the 6.5mm slot.

It looks to me that the left end of the 6.5mm slot is extremely close to the bottom of the 10mm slot given from the other view. If it isn't exactly in line then it is less than 0.1-0.2mm to the right, which I assume would be inconsequential.

As I said I could be wrong, these are just my assumptions I would probably try if I were building it (which I might at some point, it looks interesting). Hopefully someone with actual knowledge will post to help you out. Good luck with the build and please post your results once you've finished, or even while you're building it.

sarel · Jan 4, 2018

Cogsy said:
I may be wrong here (it's happened before) but is the overall dimension, or even the placement of the 3mm hole really critical here? I'm assuming that as long as the valve has enough room to complete its travel in each direction then it should function. Of course the distance from the crankshaft to the 3mm hole is critical for timing but that depends on other parts. I'm not a steam guy though, so may well be wrong.

It looks to me that the left end of the 6.5mm slot is extremely close to the bottom of the 10mm slot given from the other view. If it isn't exactly in line then it is less than 0.1-0.2mm to the right, which I assume would be inconsequential.

As I said I could be wrong, these are just my assumptions I would probably try if I were building it (which I might at some point, it looks interesting). Hopefully someone with actual knowledge will post to help you out. Good luck with the build and please post your results once you've finished, or even while you're building it.

Thanks for your comments, you are most likely correct. Hopefully the designer will also comment.

bruedney · Jan 4, 2018

Hi Sarel

Have you printed the plans out on A3? I would suggest using the dimension of a known measurement to determine the missing dimensions.

I have built one of Julius' engines and that is what I did. I am currently redrawing his Clayton Undertype steam wagon (17 A2 pages) and they too have a few missing dimension but generally you can figure them out.

Julius also puts his email address on his plans and is always happy to help if he can.

regards
Bruce

sarel · Jan 5, 2018

Hi Bruce,

Thanks. After sending the mail to Julius, I realized that it is 1:1 scale and I can measure on the A3 drawing!! I also mailed him and he updated the drawing to show the missing sizes, I received an email this morning with the sizes and they are what I measured!

Regards,
Sarel

Julius de Waal Simple Horizontal Steam engine for beginners

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