By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale Jan 24th

Belt Up

All Topics | Latest Posts

Search for:  in Thread Title in  
Journeyman02/06/2020 09:48:27
avatar
801 forum posts
141 photos
Posted by Mike London on 02/06/2020 09:30:06:

If you look at any belt sander / linisher you will see a crowned pulley...

Only if it is a good quality one! Mine definitely hasn't:-

roller.jpg

In fact the whole thing is a lesson in mediocre engineering (see my review BDS 460 Belt Sander).

John

JasonB02/06/2020 10:20:40
avatar
Moderator
18081 forum posts
1988 photos
1 articles

I've not noticed a crown on my belt sanders, maybe it's due to them all having tracking adjustment.

Simon Williams 302/06/2020 10:46:40
507 forum posts
80 photos

If you had a crown on your belt sander pulley the belt wouldn't run flat. Hence it needs (the added complication of) a tracking adjustment.

Rgds Simon

Mick B102/06/2020 12:49:32
1573 forum posts
84 photos
Posted by Simon Williams 3 on 02/06/2020 10:46:40:

If you had a crown on your belt sander pulley the belt wouldn't run flat. Hence it needs (the added complication of) a tracking adjustment.

Rgds Simon

I think so too. I've got a Parkside cheapie belt sander from Lidl that clamps to a workbench and I use it for wood and ally flats and chamfering the edges. It hasn't got any crown I can see, the track adjustment works fine, and it's becoming one of my standard go-to tools.

It's a superb example of mediocre engineering at its very finest.

laugh

Mike London02/06/2020 15:29:30
11 forum posts

Both my belt sanders are older and British. Both have crowned pulleys and tracking.
Set up the tracking on a new belt and when I do some hard sanding and drag the belt to one side, release the pressure and it re-centres.

Maybe I am not keeping abreast with modern engineering practice.

Speedy Builder502/06/2020 15:36:38
2005 forum posts
140 photos

My belt sander pulleys are crowned, its the flat plate between the pulleys that gives you a flat sanding surface.

John Baron02/06/2020 16:01:35
avatar
290 forum posts
122 photos

Hi Guys,

If you think that the pulley is flat, lay a straight edge across it !

Journeyman02/06/2020 16:35:48
avatar
801 forum posts
141 photos

Well, I put a straight edge on the roller pictured above - definitely flat although it does taper by about .3mm from one end to the other. The drive roller at the other end has though got what could be described as tapered ends so not quite crowned but almost!

John

DiogenesII02/06/2020 17:20:33
112 forum posts
46 photos

As mentioned above, one can simply machine opposing shallow tapers - 2 degrees will do it - and blend using a file.

This tracks fine with 6" pulleys at 2850rpm, and the tracking adjustment is capable of putting the edge of the belt exactly on line with the edge of the platen (and keeping it there) if needed. Both of the wheels have a shallow 2 degree crown.

img_1108.jpg

John Baron02/06/2020 17:21:39
avatar
290 forum posts
122 photos

Hi Guys,

I used to think that line shaft pulleys were flat, until you stood one up on a flat surface and it leaned to one side or the other !

Mick B102/06/2020 19:28:53
1573 forum posts
84 photos
Posted by Speedy Builder5 on 02/06/2020 15:36:38:

My belt sander pulleys are crowned, its the flat plate between the pulleys that gives you a flat sanding surface.

Well, I gotta let you and John Baron score on that one!

I took a close look at my Parkside with a straightedge and there is something - though 'cos the big roller feels like it's covered in some sort of springy plastic, it'd be very hard to measure.

Never mind, it was cheap, it holds its line and works well - I wouldn't now want to be without it.

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
ChesterUK
cowells
Eccentric July 5 2018
emcomachinetools
Allendale Electronics
Warco
Eccentric Engineering
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