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flywheel spacer material and method
https://ausmini.com/forums/viewtopic.php?f=5&t=75441		 Page 1 of 1
Author:  mickmini [ Sat Feb 11, 2012 9:15 pm ]
Post subject:  flywheel spacer material and method
What is recommended to make up some spacers for the drive straps on a light steel flywheel?

Just mild steel, or does it need to be something harder?

How do you usually make them up?

Going to see if i can use my mates Russian lathe to have a go at this myself if this is how it should be done. It will be the first time i have turned metal since i made the obligatory centre punch in year 7 :lol:

The old ones i have are 0.200" and i need 0.400" by my measurements of the old lightened cast one and the new steel one. So i will make the ID and OD he same as these.

cheers
michael
Author:  dodge [ Sat Feb 11, 2012 9:59 pm ]
Post subject: 
yr 7 we were turning cones for bong heads...
Author:  Phat Kat [ Mon Feb 13, 2012 9:22 pm ]
Post subject:  Re: flywheel spacer material and method
Break it down Mr Armchair Mechanical Engineer :P .

What forces are acting on these spacers, and how much?
What is the purpose of these spacers?
What defines the sucess of the spacers?


Answer those and you'll have your material requirements.

I thought I should play nice after a drunken dumby spit I had somewhere else over the weekend :lol:

Oh, and drill your stock with a clearance hole for you bolt and turn the OD to the required diameter... the next bit is up to how fancy you want to get and what you have available.... you could;

a) cut them to lenght with a hack saw plus clean up material then run them over a linisher till you get your desired height

b) part them of in the lathe to the required length (don't be scared of that parting tool now :P)

c) cut them with material to clean up then surface grind (or mill... or both) them to the required height.


Ok? Good? Thats all the help I'm going to be :P so until the Doc comes along or someone else you'll have to like it :lol:
Author:  drmini in aust [ Mon Feb 13, 2012 10:16 pm ]
Post subject: 
Michael, I make these all the time.
Ask nice and you can have a set. :P
Thickness = whatever was faced off the flywheel- .200" for mine.
This ensures the straps are flat (if clutch assembly height is correct).
OD is ~16mm ,I use 1020 shafting or black MS bar.
Drill the hole 3/8" neat. Use with the original flat washer, under the straps.
I don't use the lock washers- I Loctite the screws in with 262.
Author:  mickmini [ Tue Feb 14, 2012 9:02 pm ]
Post subject:  Re: flywheel spacer material and method
Phat Kat wrote:

I thought I should play nice after a drunken dumby spit I had somewhere else over the weekend :lol:



OOOh - do tell :lol:

Phat Kat wrote:
Oh, and drill your stock with a clearance hole for you bolt and turn the OD to the required diameter... the next bit is up to how fancy you want to get and what you have available.... you could;

a) cut them to lenght with a hack saw plus clean up material then run them over a linisher till you get your desired height

b) part them of in the lathe to the required length (don't be scared of that parting tool now :P)

c) cut them with material to clean up then surface grind (or mill... or both) them to the required height.


Seems like i was thinking along the right lines. Thanks PK.
Author:  mickmini [ Tue Feb 14, 2012 9:16 pm ]
Post subject: 
drmini in aust wrote:
Michael, I make these all the time.
Ask nice and you can have a set. :P


Won't learn if you do it for me now will i? :roll:

drmini in aust wrote:
Thickness = whatever was faced off the flywheel- .200" for mine.


Light steel flywheel arrived from UK without spacers. No facing off a cast flywheel has occurred, just a thin steel flywheel that needs spacers :roll:

drmini in aust wrote:
This ensures the straps are flat (if clutch assembly height is correct).


Yep, what i am aiming for.

drmini in aust wrote:
OD is ~16mm ,I use 1020 shafting or black MS bar.


Good, easy to get a hold of.

drmini in aust wrote:
Drill the hole 3/8" neat. Use with the original flat washer, under the straps.


There was some debate in another thread about this. I assume this is because your spacers are larger OD than the original flat washers and you are allowing more room for strap bending when clutch disengaged.

If the spacer is the same OD as the washers, it has the same effect. Am i missing something?


drmini in aust wrote:
I don't use the lock washers- I Loctite the screws in with 262.


I could not get 262 so is 272 OK?
On the Henkel website the only difference is the thread diameter on the 272 is larger and they quote 450deg F max temp. Heat is needed to release both types...

cheers
michael
Author:  Phat Kat [ Tue Feb 14, 2012 9:18 pm ]
Post subject:  Re: flywheel spacer material and method
mickmini wrote:
Phat Kat wrote:

I thought I should play nice after a drunken dumby spit I had somewhere else over the weekend :lol:



OOOh - do tell :lol:

Phat Kat wrote:
Oh, and drill your stock with a clearance hole for you bolt and turn the OD to the required diameter... the next bit is up to how fancy you want to get and what you have available.... you could;

a) cut them to lenght with a hack saw plus clean up material then run them over a linisher till you get your desired height

b) part them of in the lathe to the required length (don't be scared of that parting tool now :P)

c) cut them with material to clean up then surface grind (or mill... or both) them to the required height.


Seems like i was thinking along the right lines. Thanks PK.


Glad it helps, and like the Doc says, CS 1020, 1030 anything like that should be fine. Once the bolts are done up there is no load on the spacer anyway (appart from the load load from the bolt being torqued up, which is nothing for any steel).

:lol: as for the drunken dumby spit, somethings are best forgotten :lol:
Author:  mickmini [ Tue Feb 14, 2012 9:37 pm ]
Post subject:  Re: flywheel spacer material and method
Phat Kat wrote:

:lol: as for the drunken dumby spit, somethings are best forgotten :lol:


needs more drinking then :lol:
Author:  drmini in aust [ Wed Feb 15, 2012 7:23 am ]
Post subject: 
Michael you can bin the washers if you want and make the spacers thicker.
On a cast flywheel with .200" faced off, the shoulder of the bolt does not go all the way to the flywheel. If you put the washers against the flywheel they then have 1/16" clearance on the 5/16" thread.
So, I put them against the straps.
Your situation may be different with that flywheel, I dunno.
Diameter of the 3 spacers isn't that important- the bolt head on top of the straps is only 9/16" A/F hex.
And when engaged, the straps `should' be parallel to the flywheel anyway and are in tension when under load.
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