By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale May 23

John Olsen's Unimat Belt Drive

Download full plans

All Topics | Latest Posts

Search for:  in Thread Title in  

Articles

Unimat Belt Drive

Unimat Belt Drive

John Olsen improves the drive arrangements of this well made benchtop lathe.

Neil Wyatt22/05/2018 10:22:32
avatar
Moderator
15831 forum posts
672 photos
73 articles

As promised, plans for the belt drive in MEW 168 are at www.model-engineer.co.uk/unimat

Neil

JasonB22/05/2018 10:28:44
avatar
Moderator
15186 forum posts
1550 photos

Neil, seems to be a problem with the PDF files as the drawings are missing the dimensions

Neil Wyatt22/05/2018 11:08:48
avatar
Moderator
15831 forum posts
672 photos
73 articles

The dimensions are there, but in a very tiny font.

When importing to TurboCAD all the dimension lines were off the page and the dimension numbers were tiny. I was able to fix the lines, but not the numbers.

They are readable if you zoom in.

Neil

JasonB22/05/2018 11:17:33
avatar
Moderator
15186 forum posts
1550 photos

1000% and good eyesight is needed but some of the dim lines don't seem to go to any feature on the drawing

unimat lines.jpg

John Hinkley22/05/2018 17:18:43
avatar
700 forum posts
226 photos

Neil,

I think you'll find the article is in MEW 268! I tried playing around with one of the files ( Cshaft_10 ) by importing it into Inkscape and re-exporting it as a DXF file to my CAD program. The resulting drawing was MASSIVE but the dimensions, as you say, were miniscule. By scaling the drawing to a manageable size, I tried re-dimensioning it. As Jason says, the dimension lines don't line up with any intersections and thus are meaningless. One, the (almost ) width of the pulley is labelled 28.65. Seems a strange value to me. At this point, I decided that the lawn needed mowing, so gave up the idea of converting said drawings. I don't have a Unimat, so the exercise was purely one of an intellectual challenge. It could be done, but not without the required dimensions.

John

JasonB22/05/2018 17:30:05
avatar
Moderator
15186 forum posts
1550 photos

My thoughts are that Neil imported a metric DXF drawing but had units set to imperial so he has a 1:1 drawing of a 32" dia pully but the font is still set to 10 or 12pt which would be fine if the part was the actual 32mm dia Big give away is that the dimensions are quite readable when zoomed to 2540%.

I have asked him to send me one of John's DXF file so I can try for sure but I can replicate similar issues by importing a drawing with the wrong units that wants to print on a 108" wide sheet of paper!

 

Edited By JasonB on 22/05/2018 17:30:54

JasonB22/05/2018 18:41:52
avatar
Moderator
15186 forum posts
1550 photos

Tried it with a DXF of teh 41T gear.

If I import it with imperial units it comes up as per neil's PDF and if I add my own dimensions they are as small as Neil's. My 9.55 is highlighted and corresponds with the 9.55 on the drawing. If I try to print this to PDF it thinks the sheet is 108" wide.

uniimperial.jpg

Same DXF imported as metric units and same dimension added by me except this time it come up the right size and if I try to print to PDF it will fit an A4 sheet

unimetric.jpg

The 32.67 dimension that does not really point to anything is actually the outside radius of the pulley but I can't find what the 18.81 and 12.81 relate to as the hole is 14 dia so not even worth trying to redimension the drawings even if I could be bothered.

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

Support Our Partners
Ausee.com.au
Eccentric July 5 2018
ChesterUK
Warco
Eccentric Engineering
TRANSWAVE Converters
Allendale Electronics
emcomachinetools
Sarik
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