Thanks: 0
Likes: 0
Needs Pictures: 0
Picture(s) thanks: 0
Results 1 to 3 of 3
Thread: 1" BSP as a nut & bolt thread.
-
21st July 2014, 11:31 PM #1Senior Member
- Join Date
- Feb 2013
- Location
- Laidley, SE Qld
- Posts
- 368
1" BSP as a nut & bolt thread.
I've been asked to make new pins for this bolt together crankshaft, its out of a 50 or 60 year old chaff compactor , made in Australia. The pins have a 5° total angle taper on each end, and are pulled tight into the crank throws with a nut. The threads on the pins are had me scratching my head for a while until I figured they are 1" BSP, 11 tpi.
Presumably the makers wanted to use as fine a thread as possible so that a) the pins could be pulled in as tight as possible and b) to stop the nuts loosening from vibration. When the compactor was made the only standard threads used in Australia in the 1.125"/1.25" range were BSW 7 tpi or BSF 9tpi.
Or you could think outside the box and go finer still with 1" BSP-11, quite clever I reckon.
-
21st July 2014 11:31 PM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Location
- Advertising world
- Posts
- Many
-
22nd July 2014, 10:56 AM #2.
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 27,788
Yep pretty clever.
I'm a bit of a fan of BSP threads. When I built a metal free (i.e. used lots of plastic) laboratory in the 1980's I used a lot of 3 and 6mm white poly sheet, and 1/2 & 3/4" black poly pipe and irrigation and cut hundreds of BSP threads with the set of BSP taps and dies at work. The lab walls were made of marine ply and I drilled and tapped the ply direct and clad with 3mm poly sheets using 1/2" irrigation fittings liberally coated in epoxy.
I have since inherited FILs BSP dies (1/2", 3/4", 1" and 1.5") and then purchased a set of taps and used them on pipe working, like my reticulated compressed air but also on an all aluminium chainsaw mill that I made which uses 3/4" Al tubing
-
22nd July 2014, 03:29 PM #3Intermediate Member
- Join Date
- Jul 2012
- Location
- Malvern East
- Posts
- 40
Not Quite
BSP as a standard has always had parallel threads and tapered threads / self sealing.
Parallel was always used on HD pipe for a face seal or as you have discovered when a fine thread is required on a large dia similar to M1.5 M2 M3 etc as shaft locking nuts
Bruce
Similar Threads
-
New Thread Title to Replace "today's tool gloat"
By Oldneweng in forum METALWORK FORUMReplies: 104Last Post: 7th June 2014, 03:58 PM -
Dainichi universal machine (previous thread under "Mitsubishi" )
By YarrD in forum METALWORK FORUMReplies: 5Last Post: 28th January 2014, 09:47 PM -
Hammer bandsaw - bolt hole thread size?
By paul.cleary in forum BANDSAWSReplies: 7Last Post: 3rd July 2012, 06:41 PM -
american thread bolt 8-32 where?
By old_picker in forum METALWORK FORUMReplies: 6Last Post: 6th August 2011, 06:47 PM -
how to tell the thread of a bolt.
By weisyboy in forum NOTHING AT ALL TO DO WITH WOODWORKReplies: 8Last Post: 28th May 2009, 12:00 PM