Project of the Month built by mirek111

Help Support Home Model Engine Machinist by donating using the link above or becoming a Supporting Member.
Home Model Engine Machinist > Showing Them > A Work In Progress > Inspiration for new air motor

Reply
 
Thread Tools
Old 04-25-2018, 03:46 PM   #91
Charles Lamont
 
Join Date: Mar 2011
Location: UK
Posts: 466
Liked 118 Times on 83 Posts
Likes Given: 14

Default

Quote:
Originally Posted by Brian Rupnow View Post
I machined everything with an HSS tool, with the lathe running at 200 rpm.
That is 260 ft/min on the rim. The recommended speed for HSS tools on grey iron is about 60 ft/min (depending very much on who is doing the recommending).

To finish cast iron I use silicon carbide paper and kerozene, with the paper wrapped round something flat, like a file with a sound handle, so as to avoid the mortal sin of rounding the crisp geometry.

Your side of the pond people generally seem to go for a far higher degree of shine than would be considered good taste here, where going mad with a buffing wheel is reserved for bits of motorbike.


Charles Lamont is offline  
 
Reply With Quote
Old 04-25-2018, 08:05 PM   #92
Brian Rupnow
Project of the Month Winner!!!
 
Join Date: May 2008
Location: Barrie, Ontario Canada
Posts: 10,253
Liked 4127 Times on 3273 Posts
Likes Given: 37

Default

Well, we didn't quite get there today, but we got awfully close. I have two gaskets to make and I have to set the valve timing, but other than that I think I'm ready for a trial run.----Tomorrow


__________________
Brian Rupnow
Brian Rupnow is offline  
Ghosty Likes This 
Reply With Quote
Old Yesterday, 12:50 PM   #93
werowance
HMEM_SUPPORTER.png
 
Join Date: Sep 2011
Posts: 311
Liked 98 Times on 53 Posts
Likes Given: 6

Default

so the brass arm riding on the eccentric is what is running the valve right? held on the pivit pin via a set screw?
its looking very nice.
looking forward to the test run.
werowance is offline  
 
Reply With Quote
Old Yesterday, 12:50 PM   #94
Brian Rupnow
Project of the Month Winner!!!
 
Join Date: May 2008
Location: Barrie, Ontario Canada
Posts: 10,253
Liked 4127 Times on 3273 Posts
Likes Given: 37

Default

Morning has come, my gaskets are made, my engine is timed, but it won't run. OH POOP!!! Howevah--if I disconnect the link which runs from the Y shaped yoke and lift/lower the actual valve "by hand" I can find one position where
air is being passed to the cylinder (and this thing is strong considering the 7/8" bore), and one position where no air is being passed to the cylinder. This may simply be a matter of tailoring the length of the link so the two positions I found "by hand"correspond with the max/min positions of the yoke. Maybe an adjustable length link until I find the "sweet spot".
__________________
Brian Rupnow
Brian Rupnow is offline  
 
Reply With Quote
Old Yesterday, 01:56 PM   #95
Brian Rupnow
Project of the Month Winner!!!
 
Join Date: May 2008
Location: Barrie, Ontario Canada
Posts: 10,253
Liked 4127 Times on 3273 Posts
Likes Given: 37

Default

So--Here we go with the old adjustable link trick!!
__________________
Brian Rupnow
Brian Rupnow is offline  
 
Reply With Quote
Old Yesterday, 03:57 PM   #96
Brian Rupnow
Project of the Month Winner!!!
 
Join Date: May 2008
Location: Barrie, Ontario Canada
Posts: 10,253
Liked 4127 Times on 3273 Posts
Likes Given: 37

Default

So--all it took was a little bit of patience and a bit of luck, and Hey Presto--We have a running engine. It's beautiful!!! I have painting and polishing yet to do, but the design is proven. I will be selling the plans to this engine for $25 Canadian funds. Thank you for all sticking with me through the build.---Brian
__________________
Brian Rupnow
Brian Rupnow is offline  
 
Reply With Quote
Old Yesterday, 10:07 PM   #97
Ghosty
 
Join Date: Sep 2016
Location: NSW Australia
Posts: 290
Liked 277 Times on 124 Posts
Likes Given: 143

Default

Brian, Congrats on another runner.

Cheers
Andrew
Ghosty is offline  
 
Reply With Quote
Old Yesterday, 10:13 PM   #98
Johno1958
HMEM_SUPPORTER.png
 
Johno1958's Avatar
 
Join Date: Sep 2015
Location: Bendigo Australia
Posts: 97
Liked 39 Times on 19 Posts
Likes Given: 294

Default

Congrats Brian .Wonderful engine
John


__________________
If at first I don't succeed I get the hammer out.
Johno1958 is offline  
 
Reply With Quote
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Inspiration for a 3rpm motor stragenmitsuko The Break Room 15 11-05-2016 05:46 PM
Some Inspiration milotrain Photos and Videos 0 02-10-2011 07:57 PM
Disability and Inspiration Cedge The Break Room 1 01-13-2009 06:57 PM
Inspiration and a project Powder keg The Break Room 14 08-03-2008 05:37 PM
more inspiration kustomkb The Break Room 3 07-04-2008 10:20 PM



Newest Threads






- Top - Member List