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STANDARD ENGINE NEW GEARS

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rbprice
Senior Member
Username: rbprice

Post Number: 524
Registered: 11-2001


Posted on Tuesday, August 18, 2015 - 11:18 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The picture shows a new set of helical gears for a 1902 Standard four cylinder engine. The three new gears were missing and the challenge was first figure out the ratio between the gears and then calculate the special helix angles to match the center distances.

With some profound suggestions from George Coates III, we were able to calculate the angles, get the gears made and bring an old engine closer to running order. The work to enclose the gears and and a special collar to make it easy to time the camshaft to the crankshaft is the next phase.

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russell
Senior Member
Username: russell

Post Number: 85
Registered: 08-2003


Posted on Tuesday, August 18, 2015 - 02:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Good to see. Well done and worthwhile.
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jb_castagnos
Senior Member
Username: jb_castagnos

Post Number: 1088
Registered: 07-2002


Posted on Wednesday, August 19, 2015 - 10:51 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Bob, glad to see y'all got the gears worked out, nice work. That's a fine engine.
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rholcomb
Senior Member
Username: rholcomb

Post Number: 64
Registered: 10-2004
Posted on Friday, August 21, 2015 - 06:01 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Bob do you have more pics Thanks Bob,
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rbprice
Senior Member
Username: rbprice

Post Number: 526
Registered: 11-2001


Posted on Friday, August 21, 2015 - 07:49 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Here is a STBD side view showing the cam shaft running alongside of the engine. Note the construction that is much like a steam engine with the large diameter tie rods and diagonal bracing.
The 16T gear that drives the cam shaft is inside the casting on the left.

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russell
Senior Member
Username: russell

Post Number: 86
Registered: 08-2003


Posted on Friday, August 21, 2015 - 11:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Gear cutting is a bit of a black art is it not? A few years back (when I had money!) I got some new 2:1 reduction gears cut for an 8L3 Gardner. I made an impassioned plea to be able to watch him setting it all up. Helical gears of course and real big diameter. But he wouldn't hear of it.
Working on teeth is my trade/profession but I am unlikely to move across to steel -the local garage proprietor always told me "Stick to your trade, laddie!" as I got various parts for the old man's car. I knows me place mister.
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rbprice
Senior Member
Username: rbprice

Post Number: 527
Registered: 11-2001


Posted on Saturday, August 22, 2015 - 10:23 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Actually Russ, gear cutting is quite a well defined art form. There are lots of tricks having to do with the fine points of setting up what ever machines you may have and the older ones more so than the new CNC controlled machines. And knowing what kind of holding tool has a large component of experience in it.

These gears were a little unusual because of the odd helix angles but that is what the precision dividing head is for.

To me, what is really interesting is the display of knowledge shown by the folks at Standard way back in 1902 that allowed them to design the engine first, getting the center distances where they wanted them and then backing into the helix angle for the gears so they had the required center distance. Put another way, the Pitch Diameter of a helical gear is directly related to the helix angle.
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russell
Senior Member
Username: russell

Post Number: 87
Registered: 08-2003


Posted on Saturday, August 22, 2015 - 04:36 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Ummmm, thank you Robert. It is the sort of art that you can look in books ad nauseum but you have to see it and do it yourself to finally get it. I have a Tom Senior at the yard that I bought from an old (now late) mate. It has all the goodies and I cleaned up and treasure the dividing head at home here. One day soon, after I work a few other things off the list! Until then, we dream, plan and slave!

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