Click here to return to the home page.
Image of a road.
Who's Online Now
5 registered members (SALMO, Rev 4K, Hamwich, Edwin, M3W55), 203 guests, and 10 spiders.
Key: Admin, Global Mod, Mod
Top Posters(30 Days)
+8Rich 331
John V6 261
TBM 191
CooperMan 152
Alistair 142
Newest Topics
Hello! - first post on here
by Cumbriankeith. 26/09/20 03:24 PM
Blackjack Avion
by IMHO. 26/09/20 12:41 PM
Workshop Note: LED Headlamps
by DaveW. 26/09/20 12:28 PM
LED sidelights & headlights
by John V6. 26/09/20 11:12 AM
Speedster Wheels
by Peter J. 26/09/20 11:01 AM
VDO Instrument Manual
by IvorMog. 25/09/20 07:19 PM
Latest Photos
How now brown cow
wait for it
Stonor breakfast club - Oxfordshire
Cotswold Classic Tour 19/9/20
Rattray and Troup 4/4 80th
Newest Members
Koopz, hashluck, KennyW, David Stepanis, Malroy
7166 Registered Users
Forum Statistics
Forums34
Topics39,465
Posts651,594
Members7,166
Most Online1,033
Dec 28th, 2019
Today's Birthdays
beneviro, Dolph
Previous Thread
Next Thread
Print Thread
BS939 grade B #607071
09/12/19 09:38 AM
09/12/19 09:38 AM
Joined: Apr 2014
Posts: 5,715
Renfrewshire
BobtheTrain Offline OP
Charter Member
BobtheTrain  Offline OP
Charter Member

Joined: Apr 2014
Posts: 5,715
Renfrewshire
Hello All,
I'm buying an engineer's square to set up some woodworking machines and I am wondering what the accuracy of the title standard is?
BTW - Any recommendations on which square to buy? Thanks.


Best Regards
Lang may yer lum reek
Re: BS939 grade B [Re: BobtheTrain] #607077
09/12/19 10:52 AM
09/12/19 10:52 AM
Joined: Nov 2013
Posts: 395
Huntingdon
S
Scrambledsignals Offline
Learner Plates Off!
Scrambledsignals  Offline
Learner Plates Off!
S

Joined: Nov 2013
Posts: 395
Huntingdon

If you want one that is very accurate, get a Moore and Wright square. These will be more than sufficient for engineering purposes.

As you will be using it to set up woodworking machines then companies like RDG Tools sell good quality squares.

It is important to know that a square may not be accurate on both it's inner and outer edge, usually just the outer edge, so if it is important that both edges are accurate, check the Conformance Certificate.

I would avoid buying a second hand square as if they are dropped it can knock the accuracy.

Re: BS939 grade B [Re: BobtheTrain] #607078
09/12/19 10:58 AM
09/12/19 10:58 AM
Joined: Dec 2015
Posts: 615
Monmouthshire, Wales
F
Fuel.inj Offline
Talk Morgan Regular
Fuel.inj  Offline
Talk Morgan Regular
F

Joined: Dec 2015
Posts: 615
Monmouthshire, Wales
As stated get a quality manufactured item M&W or Starrett and you won’t go far wrong. Avoid Chinese etc.

Re: BS939 grade B [Re: Scrambledsignals] #607095
09/12/19 01:18 PM
09/12/19 01:18 PM
Joined: Apr 2014
Posts: 5,715
Renfrewshire
BobtheTrain Offline OP
Charter Member
BobtheTrain  Offline OP
Charter Member

Joined: Apr 2014
Posts: 5,715
Renfrewshire
Originally Posted by Scrambledsignals

If you want one that is very accurate, get a Moore and Wright square. These will be more than sufficient for engineering purposes.

check the Conformance Certificate.

I would avoid buying a second hand square as if they are dropped it can knock the accuracy.

Thank you SS. I have been looking at M&W as I know they are a well established firm, I knew of them when I was doing my apprenticeship at Linwood. How do I see the Conformance Certificate?
I certainly wouldn't buy second hand,


Best Regards
Lang may yer lum reek
Re: BS939 grade B [Re: BobtheTrain] #607105
09/12/19 02:15 PM
09/12/19 02:15 PM
Joined: Nov 2013
Posts: 395
Huntingdon
S
Scrambledsignals Offline
Learner Plates Off!
Scrambledsignals  Offline
Learner Plates Off!
S

Joined: Nov 2013
Posts: 395
Huntingdon
Am fairly sure that M&W give full details on their products on their website.

Have a look at:


https://www.bowersgroup.co.uk/product-range/moore-wright/4003-traditional-engineers-square.html

Re: BS939 grade B [Re: Scrambledsignals] #607114
09/12/19 03:06 PM
09/12/19 03:06 PM
Joined: Apr 2014
Posts: 5,715
Renfrewshire
BobtheTrain Offline OP
Charter Member
BobtheTrain  Offline OP
Charter Member

Joined: Apr 2014
Posts: 5,715
Renfrewshire
Thank you Scrambled. This doesn't give angle tolerances but I have phoned Bowers and two very helpful people are looking into BS939 for me. The details on the site you sent give the parallelism of the blade and handle which is good but not quite what I was looking for. Cheers.


Best Regards
Lang may yer lum reek
Re: BS939 grade B [Re: BobtheTrain] #607120
09/12/19 04:02 PM
09/12/19 04:02 PM
Joined: Apr 2014
Posts: 5,715
Renfrewshire
BobtheTrain Offline OP
Charter Member
BobtheTrain  Offline OP
Charter Member

Joined: Apr 2014
Posts: 5,715
Renfrewshire
Bowers have just got back to me. The tolerance at the blade end is six tenths of a thou., so should be accurate enough!

Last edited by BobtheTrain; 09/12/19 04:03 PM.

Best Regards
Lang may yer lum reek
Re: BS939 grade B [Re: BobtheTrain] #607196
09/12/19 10:57 PM
09/12/19 10:57 PM
Joined: Nov 2013
Posts: 395
Huntingdon
S
Scrambledsignals Offline
Learner Plates Off!
Scrambledsignals  Offline
Learner Plates Off!
S

Joined: Nov 2013
Posts: 395
Huntingdon
Originally Posted by BobtheTrain
Bowers have just got back to me. The tolerance at the blade end is six tenths of a thou., so should be accurate enough!


Good enough for anything I do on a milling machine!


Moderated by  Aeroman, Simon 

Powered by UBB.threads™ PHP Forum Software 7.7.1