Team Build 8

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dalem9 ...

Item number 23 is the Cylinder Rod Packing Gland found on page 13 zone B1.
It's also the Cylinder sub assembly on page 16 zone B3, its mounted oo the Top Cylinder Head item 22.

You should download the Excel sheet... that is where all the Item Numbers, builders and other information.

Pat H.

 

[maverick]

Chuck,
The con rod big end is designed the same as full sized steam engines of that period.
the rod and keeper were steel and had a 2 part "brass" sandwiched between them.
This design allowed adjusting a worn bearing and would be a nice detail to have on
the model.
I think it best to propose any big changes to the team and see what the consensus is.
Small changes to simplify or embellish parts shouldn't be a problem but it's always
good to communicate. I'm thinking of a 6 spoke flywheel rather than the 8 spoke in
the drawings because the 8 spoke looks too thick and heavy, any comments?

Regards,
Maverick

 

[dalem9]

Hi Pat yes I am going to make the packing gland ; Every thing is going along well , you are doing a good job ! Dale

 

[dalem9]

Pat Also were do I go to see the same plans as you. Dale

 

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dalem9 ...

The plans are : (see also thread #72)
http://homemodelenginemachinist.com/downloads/oldboatguysengineplanpdf-125.html

The Excel is here: (see also thread #84)
http://www.homemodelenginemachinist...52767331-team-build-team-build-8-details.xlsx

The spreadsheet has not been updated for assignments, I will update probably tomorrow. However, the item numbers etc are okay.

Chuck and Maverick ... I agree ... need to suggest changes before hand. I would like to keep that detail. However, if you want yours to be changed I don't see why not ... after all it is yours!

Silver solder ... I can do mine and others if necessary.

The flywheels ... 6 spokes will look great. << Edit

Pat H.

 

[chrispare]

I must be missing something here but what gets silver soldered?
Also I was thinking of using stainless for the pistons ( would that be an issue?)
Chris

 

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Chris,
Item 27 (Valve Stem) is silver soldered to item 29 (Valve Link Rod)
according to the note on page 14 zone B3 .
But it is not clear to me as to why ... since it is bolted. Maybe for additional mechanical strength.

Additionally there seems to be fit issue with those parts (.087 hole vs .093 pin). Looks like that area needs to be looked into for clarification.

Maybe someone would comment on that.


Instead of Brass for the Piston ... stainless would be the way to go.


Pat H.

 

[joe d]

Hi guys

sorry for the delay in getting back to you, I've been out of town since Monday.

I'm happy with page 12, leaving page 7 for Chuck.

Joe

 

[chucketn]

Now I am scared! I just noticed most of the group are POM winners! Hope I can make muster!

Chuck

 

[chrispare]

Chuck, the whole purpose of a team build is not to have this stunning project in the end ( although is a bonus)
It's to challenge yourself ion parts that you can do and the challenge of having 10 guys in different parts of the world build pieces of something and being able to put it all together working. Also the making of new friends.

You will do just fine,
Chris

 

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Okay joe d is taking on page 12 items 18,19,20 and 21.

With that I have updated the Excel spreadsheet ...

View attachment Team Build 8 details.xlsx

It should say November 15, 2012 rev1


Pat H.

 

[maverick]

Thanks for the update Pat. I looked at the parts you mentioned in post #107 and don't have a definite answer. The drawing shows the valve spindle #18 and valve stem offset post #27 screwed together and silver soldered. Must be for reinforcement. The valve link rod #29 must pivot at both ends, so one of the dimensions is off. There should be a few thousandths of play between them.
The stock for the crankshafts is ready to machine but the oxygen bottle needs filled before the silver soldering will happen. Still mulling over
options for the flywheels. There's a hunk of bar holding open the shop door that might work, We'll see.

Regards,
Maverick

 

[Path]

Thanks for your input Maverick ...

I had Item 27 silver soldered to Valve Spindle (18 ) but the wording on page 16 made me change it.
Also in don-tucker build thread in post 46 picture clearly shows a soldering process.
The Pin diameter (#27) (.093) I would leave as is and change the hole (on 18 ) size to .0938 (drill 3/32") or .0935" drill # 42.
Or better yet a 3/32 reamer since there is a lot of rubbing.

Chris,
Item 27 (Valve Stem) is silver soldered to item 29 (Valve Link Rod)
according to the note on page 14 zone B3 .
But it is not clear to me as to why ... since it is bolted. Maybe for additional mechanical strength.

Additionally there seems to be fit issue with those parts (.087 hole vs .093 pin). Looks like that area needs to be looked into for clarification.

Maybe someone would comment on that.

.....

Pat H.

Pat H.

 

[chrispare]

I think that the solder is to make sure nothing comes loose during operation.
I will make sure that the pin and rod fit ( i believe those are are the ones I am making)
On a different note the pistons, I have spent the better part of the evening attempting to do make one outta stainless, well my toolong is not liking it at all so... do we want Brass or Steel as the plans call for?

 

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Chris ...

Super and yes you are making those two parts ... thanks.

What type of SS are you trying to turn ... if it's 304 it can be a problem. SS 303 is not nearly as bad but does work harden.

In any case, I like Brass as it will not rust over time.

Pat H.

 

[chrispare]

Im not sure what it is, but my hss bits pretty much make alotta noise heat and dont cut very well.
oh well I tried, Ill do it brass.

 

[dreeves]

Do you guys see any reason why the spreader bars on sheet 4 can't be made of aluminum? I plan on getting started on parts this weekend.

Dave

 

[joe d]

Dave

I can't see any reason that you can't make the spreaders in ali.

Got material ordered, now the annoying waiting for delivery phase before
I can start making parts.

Joe

 

[dreeves]

I agree but wanted to check with others. I got the material for the rocker and pivot but will order the aluminum and brass for the other parts. I will get pictures of the corian I have and we can pick which will look good.

Dave

 

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Dave ...

The only issue with Aluminum for the spreader bars is stripping those small 2-56 threads.

Pat H.