Author Topic: Corliss Flywheel  (Read 2183 times)

Offline vcutajar

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Corliss Flywheel
« on: July 31, 2014, 06:50:46 AM »
Hi guys, hope everything is well.

I have a question about my MEM Corliss flywheel.  I need to drill a hole for the grub screw to hold it to the crankshaft and as the flywheel is a one piece construction I can only drill for the grub screw at an angle which is going to be fun.

Instead of one grub screw I was thinking of putting in two grub screws.  One on each side of the hub and offset by 90 degrees.  Do you think that this is overkill and one grub screw should be enough?

Vince

Offline Jo

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Re: Corliss Flywheel
« Reply #1 on: July 31, 2014, 07:24:53 AM »
Have you thought of using a key ?

Jo
Usus est optimum magister

Offline pgp001

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Re: Corliss Flywheel
« Reply #2 on: July 31, 2014, 08:47:58 AM »
I agree with Jo.
When did you ever see a full size engine with a flywheel secured by a grub screw  :ThumbsDown:

OK for vee belt pulleys etc but not in keeping with a steam engine model, it makes me cringe when I see cross head screws etc on models.

Having said all that, you might be surprised to learn that the flywheel on Agnes is actually "located in position" using no less than eight grub screws which bear down onto the four flat keys.
These are buried in the middle of the flywheel hub and can only be accessed down the holes where the spokes fit, so will never be seen again once it is all assembled.

Phil

Offline vcutajar

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Re: Corliss Flywheel
« Reply #3 on: July 31, 2014, 09:24:56 AM »
Thanks Jo and Phil.

If I use grub screws they will eventually be hidden.  If I use a key, wouldn't the flywheel still be able to move sideways?

Vince

Offline pgp001

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Re: Corliss Flywheel
« Reply #4 on: July 31, 2014, 01:11:37 PM »
Vince

This type of key is used for holding the flywheel on many old engine crankshafts, the taper locks the two together very efficiently, and would look a lot better than modern grub screws.
http://www.technifast.co.uk/documents/Page34GibHeadKeys.pdf

http://www.oldmarineengine.com/discus/messages/5/2215.gif

Google "Gib Key"

Phil

Offline Ian S C

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Re: Corliss Flywheel
« Reply #5 on: July 31, 2014, 02:54:47 PM »
When I rebuilt a Stuart Turner S9, I used a gib head key as the sole means of attaching the flywheel to the crankshaft.
On my hot air/Stirling Engines I fit the flywheels, and pulleys with two set screws at 90*, and these are usually brass screws so that they don't damage the shaft, they are done this way as the pulleys are changed often, and the flywheel is taken off when the motor is transported.  They are not scale motors, but motors in there selves, ranging from 3/8" bore, to 2 1/4" bore, and flywheels from 2" dia, to 6" dia, the heaviest around 900gm.  A bit OT I suppose, but that's me and flywheels.   Ian S C

Offline arnoldb

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Re: Corliss Flywheel
« Reply #6 on: July 31, 2014, 04:52:16 PM »
I used two M3 grub screws on my Corliss flywheel.  The holes aren't particularly noticeable.  As the flywheel is relatively large and heavy I went for two instead of just one for added security.  I made them either side of the flywheel hub, but in-line, so that tightening them up wouldn't slightly "twist" the flywheel and make it run with a wobble...

Kind regards, Arnold
Building an engine takes Patience, Planning, Preparation and Machining.
Procrastination is nearly the same, but it precludes machining.
Thus, an engine will only be built once the procrastination stops and the machining begins!

Offline vcutajar

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Re: Corliss Flywheel
« Reply #7 on: August 01, 2014, 04:53:38 AM »
Thanks guys.

Vince