Home | Links | Contact |

Printed from www.nzmeccano.com

Top Home Bottom

Fixing loose Meccano bosses

(Author: Stephen Brook)

or Put Your Hammer Away

Most loose bosses I have come across do not have a lot of play between the boss and the part it is supposed to be gripping, the boss revolving with respect to the part but not waddling. If, however, the boss is very loose this can usually also be fixed so I will start there.

The first stage in the process is to clean the mating surface between the boss and the part. Soak the joint in methylated spirit, either by using an eye dropper or a clean rag well soaked and squeezed into the joint. Work the boss to and fro with respect to the part several times then dry off the excess with a dry cloth. The meths within the joint will evaporate within a minute or so.

Next, (very loose boss only, remember), screw a STEEL long bolt or screwed rod though both tapped holes in the boss (or, of course, a short bolt if the boss is single tapped), place a small piece of smooth scrap steel against each end of the boss and put it in the vice with your third hand ( a bit of blue tack on each end of the boss helps). Tighten the vice slowly so that the end of the boss holding the part is compressed enough to stop the part waddling with respect to the boss but still able to rotate. Remove from vice, remove bolt, remove blue tak, put Elastoplast on trapped fingers, etc.

So, with the boss still turning on the part but not waddling, put a drop of Loctite 601 retainer on the joint, quickly rotate the boss a couple of times, wipe off any excess then put aside to set. This stuff will start to grab in 20 seconds or so, reach handling strength in about 15 minutes and be fully set in 3 hours. Job done and the repair is permanent and invisible.

Loctite 601 is an industrial adhesive sold by most engineering/model engineering suppliers or, of course, on line. It is not cheap but the tiny bottle seems to last forever. I have had my 10ml bottle for well over 10 years and am still using it. As to strength, I have seen a passenger carrying miniature steam locomotive running around a track with the wheels held on to the axles with Loctite 601 only. Only a blowtorch will loosen it.

POSTSCRIPT

It seems that 601 is now hard to find in 10ml bottles (on line, at least) but a near equivalent, 603 retainer, which is claimed to be better still because the mating surfaces do not need to be as clean, can be had for about £6 or £7 for 10ml.  

 

David Morgan      (at 3:13pm, Thu 31st Mar, 11)

A 3/16"(5mm) Steel ball worked fine for me, Thanks for the idea. I put a steel bolt in the boss and an ali. plate under it.

Charles      (at 10:43pm, Thu 8th Apr, 10)

Yes, I've always used a large steel ball over the peened end and a piece of rusty flexible plate at the other, and a long bolt through the boss (Meccano long bolts are steel, of course). The steel ball spreads the peening into the recesses in the pulley/gear which prevents the boss from slipping again. I've never had the need for any adhesive.

johnfromperth      (at 10:15pm, Thu 8th Apr, 10)

Squeezing a largish steel ball (from a ball bearing) against the peened side of the boss does a good job.
I endorse your comments about putting a screw rod or bolts into the threaded holes in the boss. Otherwise the pressure can collapse the holes in the soft brass.


Your name:
Your message:
Security check: (Please type in the text to prove you're a person!)
 
Login status:  You have not yet entered your user name and password. You cannot create or edit documents until you do.
Enter your user name and password to log in

Remember me

If you click on the box marked 'remember me next time', you will not have to log in again on this computer for three months.

If you don't have a user name yet, please click here

Latest documents:

(John Rogers and Neil Bedford)
Midlands Meccano Guild
100th Meeting Model Report 
 
A G gauge model 
(Colin Bull & Richard Smith)
Midlands Meccano Guild
99th Meeting Model Report 
 
98th Meeting Model Report 
 
97th Meeting Model Report 
(David Couch)
The Little Tram
An introductory Arduino project 
(G. Eiermann and M. Schild)
A Short History of MARKLIN Metall
 
96th Meeting Model Report 
83rd Meeting Model Report 
 
82nd Meeting Model Report 
Picks up three golf balls 
(Roger Marriott)
Midlands Meccano Guild
95th Meeting Model Report 
The Spanner Challenge 
 
 
 
94th Meeting Report 
(Andre Theberge)
Meccano Segway
Instructions 
(Andre Theberge)
A Meccano Segway
Arduino code 
(Andre Theberge)
A Meccano Segway
Assembly instructions 
(Michael J. Walker)
Meet the new MMG President
Geoff Wright 
The Spanner Challenge 
(Michael Walker)
Midlands Meccano Guild
93rd Model Report 
Report by Michael J. Walker. 
92nd Model Report 
(Stan Knight)
Minimal Meccano
Pocket Meccano Sets of the 1970s 
Little Lever, Bolton 
The Spanner Challenge 
91st Model Report 
(Bob Thompson)
Back to the beginning
Shop Display Model 
90th Meeting Report 
(Old Blue Gold)
Getting Old
A screwy story 
The Spanner Challenge 
Model report written by Michael J. Walker 
76th Meeting Report 
Exhibition in Nelson, New Zealand 
(Barry Gerdes)
Meccano Radio
 
 
How to flatten  
(Rod Socket)
Dear Mrs Spanner
Survival techniques for the Meccanoman's wife 
(Stan Knight)
The Top Ten Tools
Indispensable Tools for the Meccanoman 
A call for help 
The Spanner Challenge 
 
For small brass and nickel parts. Also for stripping paint and rotted zinc plating. 
(Stephen Heafield)
Waterslide Transfers
Refurbishing 0 & 00 Aero Models 
Construction details 
or Put Your Hammer Away 
Mobile Morris Crane from 1968 MM 
Bert Love's Blocksetter in colour 
The dangers of internet auctions 
(Rob Thompson pp Terry Bullingh)
BlockSetter Tower
Built by Terry Bullingham 
(Rob Thompson pp John Reid)
Captain Robert Falcon Scott
1912 Polar Sledging Party 
(Niels Gottlob)
Bucket Wheel Excavator
Transcribed from typed document with photos 
Selected Spanner messages 18th to 24th January 
Selected Spanner messages 11th to 17th January 
Selected Spanner messages 4th to 10th January 
 
(Norbert Klimmek)
Hulett Ore Unloader
A 1 to 32 Scale Model 
 
(Joe Attard of Malta)
A model ship
 
 
 
(Arup Dasgupta (ISM 652))
My E15R Motor
A repair story 
(Charles)
About Meccano
What is Meccano? 
Thoughts about modern Meccano 
Some hints and tips 
Not many in this condition I'll bet! 
 
 View all | Chat | Models | Hints and Tips | Opinion | Reviews | Mine