By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Forum House Ad Zone

Darjeeling ME Issue 4407 Corrections

All Topics | Latest Posts

Search for:  in Thread Title in  
Donald Mitchell03/07/2011 13:53:26
avatar
90 forum posts
3 photos
Hi Engineers,
 
ME Issue 4407 Corrections
 
The nut on the bottom right of page 15 should be 1/4" long and not 3/16"
 
The missing dimension on the nut on the top left of page 14 should be 5/32"
 
These corrections are confirmed by Raymond McMahon.
 
Donald Mitchell
Castle Douglas
Bonnie Scotland
JasonB03/07/2011 14:31:17
avatar
25215 forum posts
3105 photos
1 articles
Thanks, J
Steambuff03/07/2011 14:43:40
avatar
544 forum posts
8 photos

A question on the Turbo Generator Steam Valve. (Page 13)
 
It looks as if the main body is turned from a single 1/2" dia piece (Brass), The diameter of the section to the right of the 1/2" part is missing ... Is this meant to be 3/8" dia?
 
Also how do you bore the centre bore?
 
From left to right as drawn the bore is -
3/32" for 1/2" then
5/32" for 3/16" then
5/32x32 tapped for 5/16" (Therefore narrower dia) then
5/32" for 1/4"
 
Am I being stupid ... but how can you get the 5/32" dia between the tapped section and the 3/32" section (As both are narrower? (To me a bit too small for a boring tool)
 
Also for the bush coming in from the bottom ... the drawing shows the main body beind drilled for both 1/8" and 3/32" ... which is correct.
 
Thanks
 
Dave
 
JasonB03/07/2011 15:01:27
avatar
25215 forum posts
3105 photos
1 articles
The way I would interpret the drawing is that the 3/16 long bore in the centre that is drawn as 5/32 should infact be shown smaller and drilled to suit the 0.108" dia on the end of the shaft, you will need some clearance around the 0.108 for the steam so carry the tapping drill right through. ( d bit may be better for the valve seat)the dotted lines are clearly too far apart.
 
regarding the bush, it should be bored 3/32" all the way through and have a small locating spigot turned on the end 1/8" dia, this to locate into a 1/8" hole in the body to keep it in place while soldering. See the unassembled valve head drawing where the two "*" indicate silver soldering.
 
As for the body 3/8" would seem right.
 
Oh and while we are looking at parts like this I notice all the steam unions are shown with 90deg csk holes, make sure your nipples/ferrules suit as a 60deg csk is more usual (use a centre drill)

 

Edited By JasonB on 03/07/2011 15:12:11

Steambuff03/07/2011 15:17:57
avatar
544 forum posts
8 photos
Thanks for that esp the tip about the nipples/ferrules as I tend to purchase these parts.
 
I'll see if Donald/Raymond confirm the internal bore of 0.108" (Seems logical to me)
 
I hate the mix of Imperial and Metric . 7/64" is 0.109375" so why can't this be used. (Rather that try and find a 2.74mm drill)
 
Dave
 
 
JasonB03/07/2011 16:12:24
avatar
25215 forum posts
3105 photos
1 articles
No I said you need some room around the 0.108 for the steam (may have missed it in my edit) so the hole needs to be larger and the 5/32" tapping drill will do nicely.
 
J
Steambuff03/07/2011 16:19:13
avatar
544 forum posts
8 photos
Thanks Jason
 
Yes I did miss it in you edit ... I replied to your unedited posting
 
5/32" Tapping drill it is then. (Makes life a lot easier)
 
My Drawings from Blackgates should arrive next week .. so I will use them as my master.
 
This is my first build in 'Large Scale" ... so I don't want too much metal in my scrap bin (Future project bin). I have built to 16mm/ft NG before.
 
 
Dave
 
Donald Mitchell05/07/2011 15:34:08
avatar
90 forum posts
3 photos
Hi Engineers,
 
With regard to Steambuff's queries at 14:43 on the 3rd July, after consultation with Raymond, I can confirm that JasonB's reply at 15.03 on the 3rd July is spot on correct in all respects.
 
1. The very central section should be shown slightly smaller diameter on the drawing, tapping size for 5/32 is right.
 
2. As JasonB says.
 
3. 3/8 is correct.
 
4. JasonB's well spotted comment regarding the steam union counersink angles:-
Raymond makes all his own pipe fitting unions, a good point to remember.
 
Regards.
 
Donald Mitchell
Castle Douglas
Bonnie Scotland
Steambuff05/07/2011 15:42:42
avatar
544 forum posts
8 photos

Many Thanks Donald

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Sign up to our Newsletter

Sign up to our newsletter and get a free digital issue.

You can unsubscribe at anytime. View our privacy policy at www.mortons.co.uk/privacy

Latest Forum Posts
Support Our Partners
cowells
Sarik
MERIDIENNE EXHIBITIONS LTD
Shopping Partners
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest

 

Donate

donate