Finished modeling up engine, now time to build.

[doc1955]

Well I'm just about finished modeling up a walking beam engine. I started with Oldboatguys and changed a lot of it to my take and checked clearances and linkage lengths and such.
Going to start to build one for a birthday gift.

<a href="http://www.youtube.com/v/dQp9-VPxASk" target="_blank">http://www.youtube.com/v/dQp9-VPxASk</a>

[m_kilde]

Hi Doc

Nice show - thank you !

What CAD are you using ?

[doc1955]

I use NX6 Unigraphics I can export to a lot of different solids.
I've gotten spoiled I model most things p before I go into build mode to check everything out and add my take on things. When i get project built I'll do some drawings.
I use to scribble some design on a piece of paper and adjust as I went but Like I said I now am spoiled and have to do a lot less adjustments I do them in the virtual world instead.
Well I'm heading to the shop and try and get some thing done today.

[doc1955]

Well I decided to build 2 engines one for a birthday gift and one to add to my own collection.
I didn't have any plate stock the proper thickness so I took some .250 I got the material to size and started drilling holes at all the corner locations. I'll use them to line up all the angle cuts by putting pins through the holes and pull them up to a straight edge and clamp them down and mill from hole to hole.
I'll do that tomorrow and I'll post some pics.


PS  I here is a little tip  you may or may not already use but I have done this for some time. When drilling small holes and switching from center drill and back to drill I use to constantly drop or lose one or the other.  So I grabbed a magnet and place it on top of my vise an there you go you have a small tool holder to keep them from getting knocked off or dropped. Anyway just thought I'd mention it. Works extremely well when machining non-magnetic material not so good with magnetic.

[doc1955]

Cut out side plate windows and profile.
I used a piece of aluminum plate for a holding jig.
I lined up a 1/4 cutter with edge of holding jig. Then loaded side plates using 2 the 1/4 holes with pins up against the jig edge. Things went pretty good.and I now have the side plates done as far as I'm going with them untill I get them put together. I will then drill holes for mounting the shaft and link mounts.

[doc1955]

Here I'm cutting the surfaces that the bearing mounts get attached.

And the sides with all windows cut out next I'll do the spacer shafts.

[doc1955]

Didn't get a lot done today. Did get the spacers parted off faced to length and drilled and taped each end.
I turned a groove in each end and milled a hex to give them the illusion of a jam nut.





I assembled side temporary I am going to order some hex head machine screws didn't have any on hand.


Going back out in the shop to see if iI can get started on the cylinder mounting blocks next.

[ariz]

good start on the engine doc, I built it too and I'll look forward on your progress

very good work on the cad drawings too, I would like to learn it but till now my attempts were unsuccesfull 

[doc1955]

Thanks!
I do cad for work I'm a tool design engineer by trade.

Well I got the mounting blocks for the cylinders done and the cylinders.


Shot of the slot milling. I milled slots the original was holes but I changed it to three slots.











Here they are mounted into frame.

Next I'll start on bearing mount blocks for the crank and beam.

[doc1955]

Well I was busy in shop today last Christmas vacation will be over tomorrow and back to work 
So I'll only get a couple hours in the shop every day I'm hoping to get these done by the 15Th I'm going to have to pick up the pace.

Today I did the main bearing mounts.
I had some .5 x1.0 brass just begging to get used so here we go.

I cut pieces off the width of the bearing mounts. The .5 thickness of material will be sufficient for both top and bottom halves.


cut the mounting tabs to a thickness of .125 plus drilled mounting holes.


cut the width of top halve.


Separated the halves.


They fit together nicely.


I hand ground a form cutter for the top radius.


Assembled and ready for the .250 dia hole.




Milled up a little jig to hold part in vise while drilling.


Finished assembly.

Hope I not boring everyone to death here.

[ksouers]

Not boring at all, Doc.

I'm quite impressed. Man, that's some tiny work!! 

[Vernon]

Boring? No way, thanks for sharing your progress!

[ozzie46]

 Boring?  No no no, That is a very good looking rod and everything else is right on too.
Keep up the good work.

Ron

[zeeprogrammer]

Hope I not boring everyone to death here.

Not me. I haven't said much (maybe nothing come to think of it) but I've been watching! Please continue!  I've been enjoying the details and learnings.

[NickG]

Nice work Doc, really nice. I like the design of beam engine but the frame puts me off having a go looks too complex for me!
We've just got NX6 at work and the rendering stuff on it is really impressive. You can get photo like models from it now.

Nick