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

Southam

All Topics | Latest Posts

Search for:  in Thread Title in  
Eric Cox20/08/2016 09:57:24
avatar
464 forum posts
22 photos

Neil, well done for writing a clear description of construction with the novice in mind and the three drawings of the frames for clarity (whoever she may be).

A couple of queries "The frames are the long members ......." How long does one have to be a member ?.

More seriously, what is the depth of the horn block slots in the frames, 1" or 11/4"

and the pitch of the horn block rivet holes 9/8" !!!

JasonB20/08/2016 10:08:17
avatar
Moderator
12543 forum posts
1114 photos

Neil, there is also a difference between your pfd drawing of the hornblock rivit positions and that on the mag drawing.

 

Edited By JasonB on 20/08/2016 10:19:37

Neil Wyatt20/08/2016 19:43:41
avatar
Moderator
13224 forum posts
571 photos
68 articles

My dimensions for the rivet positions in the bottom part of fig 5 have been mis-interpreted when redrawn and I seem to have missed it when checking them. It is all a bit crowded even when using three drawings for all the dimensions! The 1/4" is to the bottom pair of rivets and the 1" is to the top pair, both from the base of the frame.

Unfortunately I did the drawings in my pre-turbocad days and Corel Draw's auto-dimensioning seems to be optimised for architectural drawings of big buildings not tiny locos!

The hornblock cut-out is 1 1/4" high and 3/4" wide, I think i suggest using the hornblocks themselves as a gauge (the Reeves ones are hot pressed and very accurate, other suppliers may use sand castings).

As other suppliers hornblocks may have ribs in slightly different places, it's probably best to spot through from the blocks to the frames rather than the other way around.

I'll change the topic for this thread to drawing corrections.

Neil

Eric Cox21/08/2016 10:16:53
avatar
464 forum posts
22 photos

On Fig 4 the dimensions for the two oblong apertures seem incorrect. The LH one is shown as 1/2" up from the recess and the RH one is shown as 3/16" up from the bottom of the frame.

JasonB21/08/2016 13:14:51
avatar
Moderator
12543 forum posts
1114 photos

Looks like a typo, should read 13/16" made up of the 5/16" cut out from the bottom plus the 1/2" that you mention.

These dimensions were added at a late date as I spotted that there were none showing the hight of either cutout on the original pdf. so that could explain the typo.

Edited By JasonB on 21/08/2016 13:29:08

Neil Wyatt21/08/2016 17:19:38
avatar
Moderator
13224 forum posts
571 photos
68 articles

Yes, my drawing shows the back one as 13/16 up.

These cutouts are cosmetic and the exact size/location or even leaving them out won't affect performance although I think they add to the appearance. Assuming you fit your speed control between the rear frames, then the rear hole provides a convenient place for a control-box socket.

Neil

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

Email News - Join our newsletter

Love Model Engineering? Sign up to our emails for the latest news and special offers!

Latest Forum Posts
Support Our Partners
Eccentric Engineering
Ausee.com.au
Expo Tools July 14
Shapiro
Allendale Electronics
Sarik
SPG Tools October Seventeen
emcomachinetools
Warco
TRANSWAVE Converters
ChesterUK
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

Visit the Model Engineer
Exhibition website

Model Engineer Exhibition