Author Topic: Mainshaft gear separate from main shaft A10  (Read 1579 times)

Offline Sluggo

  • Serial Hoarder, or Eccentric Collector depending on viewpoint
  • Resident Legend
  • *****
  • Join Date: Jun 2017
  • Posts: 639
  • Karma: 11
Re: Mainshaft gear separate from main shaft A10
« Reply #30 on: 17.09. 2017 09:28 »
Trevor, reread what I wrote,,, you quoted 2 very important dimensions first at the 4 decimal point which I can change by holding in my hand or breathing hard on it,,, and then the 3rd decimal point which requires a bit more heat.

Secondly then you talk about alloys, Are you talking alloy castings or gears and shafts made out of steel?    The method I describe was a method for gears and shafts I was shown in Aviation school with FAA approved tech materials and using a Cessna service center tool, I can assure you thats a time proven method with extensive scrutiny.  I summarized the technique as applied to a motorcycle part, and generally a hydraulic press would be sufficient, but I was trying to illustrate what heating and cooling techniques can do.

I *THOUGHT* I was competent with a Micrometer and worked in Aerospace as well as vehicle fleet maintenance for over a decade when I went back and took some more classes to get my federal Aviation license.  In one of the classes one of our instructors *RETAUGHT* us proper use of a caliper and micrometer.  Despite working for some of the biggest names in aerospace I learned I was using Micrometers wrong.  In which case there is a LOT of people reading them wrong.  But ol' Harold taught us a valuable lesson.  One of which is how even a little bit of heat can change dimensions.   The lesson was Mic'ing a crankshaft journal and a rod bolt.  Then we had to hold the parts in our hands during part of the lecture.  After 5 minutes we had to remeasure.  I would suggest you or anyone else try it with a Micrometer (with up to 3 decimal point measurements  IE:   0.000) you will find a surprising difference in measurements.

Now the same lesson with a caliper going to 4 decimal point.  Most modern digitals are 0-5-0 for the 4th point but some can actually read 1-9.   I can breathe heavily on a part and change that 4th point.

Now, do the same measurements with gears, bearings or shafts with one part in the freezer for 10 min and the other in a oven at 250 deg F/121.11 C and again check dimensional changes ID & OD.  I am certain you will find the measurable differences remarkable.  Its worked very well for me over the years.
Remember that any advice received on a free internet forum is generally worth about 1/2 of what you paid for it.
We overcharge every 3rd customer to pass the savings onto you.
You can have High Quality, Low price, and fast turnaround. Pick any 2, Never all 3 at the same time.

Offline peter

  • A's Best Friend
  • ***
  • Join Date: Oct 2010
  • Posts: 41
  • Karma: 0
  • Aadorf in Switzerland
Re: Mainshaft gear separate from main shaft A10
« Reply #31 on: 09.10. 2017 19:02 »
Hi,
before I forgot to mention, I dismantled all parts without warming, in the assembly I warmed the Layshaft gear, but only little, about 120° Celsius, the Layshaft I cooled in the refrigerator about 4° Celsius then under my press all slippt in without problems.

regards Peter


 
1956 Royal Enfield Bullet 350
1956 AJS 18s
1949 Royal Enfield 500 J2
1954 Golden Flash 650
1985 Virago V1000
2001 Wildstar V1600
1966 Velosolex 50
1999 Virago XV 1100
2012 Kawasaki W800
2016 KTM Duke 390

Offline Sluggo

  • Serial Hoarder, or Eccentric Collector depending on viewpoint
  • Resident Legend
  • *****
  • Join Date: Jun 2017
  • Posts: 639
  • Karma: 11
Re: Mainshaft gear separate from main shaft A10
« Reply #32 on: 09.10. 2017 22:17 »
Peter, that should do it,  You just forgot to mention one thing (Assuming there is a spouse here) Is unless your workshop is very well appointed is do this when the MRs is not at home and always clean up the evidence.
I often will open some potporri, light some incense or put some vanilla extract on some tin foil in the oven afterwards.

Installing bearings in engine cases is often quite fragrant.  I used patchouli oil and my wife came home and accused me of killing some hippy chicks.  Wanted to know why the house smelled so strong.
Remember that any advice received on a free internet forum is generally worth about 1/2 of what you paid for it.
We overcharge every 3rd customer to pass the savings onto you.
You can have High Quality, Low price, and fast turnaround. Pick any 2, Never all 3 at the same time.

Online Greybeard

  • Jack of all trades; master of none.
  • Wise & Enlightened
  • *
  • Join Date: Feb 2011
  • Posts: 6049
  • Karma: 35
Re: Mainshaft gear separate from main shaft A10
« Reply #33 on: 10.10. 2017 11:06 »
I had an old Land Rover that had its parking brake drum just behind the gearbox. Gear oil would leak onto the shoes. I would wash the shoes in petrol, dry them off and finish by baking the shoes in the oven. A bit smelly!