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GE Collar Gear CAD


Louis Luu
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Just now, Louis Luu said:

Labor Day weekend.  I have contacted my caster yet.  Will do end of week and see if there is any to pick up.

Ah ok was just wondering as I'm not on this site that often and things may be getting posted about it without me even knowing it. Thanks!

 

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Just now, Charlie Wicks said:

Ah ok was just wondering as I'm not on this site that often and things may be getting posted about it without me even knowing it. Thanks!

 

I have you on my list...I remember.  My last batch ran out so I will be getting some more.

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Yeah, those are a worm wheel/gear rather than a spur gear,  each tooth is curved to match the worm itself as well as being on a slant,   also note that the worm on the intermediate set is a double start,  if its done as a single start the fan will oscillate at about half the speed it would with the factory gear.

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if you look at the bottom of the worm,  you will see its actually a double helix,  unlike a screw which is a single helix,  there are actually two seperate spirals in the worm instead of just one,   this is what is ment by a "double start".   In a double start worm,  the tooth of the worm wheel will travel twice as far per one revolution of the worm with the same teeth size, 

The ends of the sprials at the bottom of the worm are 180 degrees apart

In comparison The worm on the rotor shaft of the fan, is a single start,  its only a single helix. There is only 1 end of the spiral

The coin op fan actually uses a triple helix worm in its nose.  Ge must love this design.

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  • 2 weeks later...
4 minutes ago, Geoff Dunaway said:

 That is amazing Louis !!!  What metal will you use when everything is ready ??

Stainless steel for the gears.  The cone will be offered in both stainless steel and brass.  I'm doing minor adjustments right now.

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7 minutes ago, Fred Summers said:

These look amazing! Great job. Is this something that we would order directly from you, or will you host it on a website like shapeways? 

I need to order a set in printed steel for me first to try out before releasing it through Shapeways.

 

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Someone contacted me about putting in an oiler on top instead of an oiler on the bottom.  An oiler on top would be easier to install but would require frequent monitoring?  Please let me know which one before I finalize it.

"Is the idea to give that front bearing an oil port topside? (the photo is a Kidney oscillator)"

image.png.e8be7993d0f2375e2d2adfee094a040e.png

vs this?

20220923_173725.thumb.jpg.01ee1356ac9cff255f0a40680d876abc.jpg

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I vote for the below the bearing oil cup. But I have to admit, it occurs to me though, why the original design pot metal bearing? All of GE's fans have oil cups, but not the collar oscillator. My speculation is the design might have had issues with oil running along the shaft and dripping or spraying vapor inside the motor housing? Is this possible, and if so, could a means be improvised to solve that possible engineering issue? I really don't intend to dampen enthusiasm for this project, you can put me down for one of everything, but maybe the learned on the subject could chime in, making the better and improved design even better.

Edited by Mike Kearns
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35 minutes ago, Mike Kearns said:

I vote for the below the bearing oil cup. But I have to admit, it occurs to me though, why the original design pot metal bearing? All of GE's fans have oil cups, but not the collar oscillator. My speculation is the design might have had issues with oil running along the shaft and dripping or spraying vapor inside the motor housing? Is this possible, and if so, could a means be improvised to solve that possible engineering issue? I really don't intend to dampen enthusiasm for this project, you can put me down for one of everything, but maybe the learned on the subject could chime in, making the better and improved design even better.

The original front housing had a tiny hole connecting the the center shaft area to the back housing.  This hole was clogged when I inspected with grease.  I removed the hole and this should not be an issue.  Along with that, the front has a recess area preventing the oil from running to the back.  I do like the idea of having a permanent oiler on the bottom for longevity.

My speculation is the oil was meant for the grease in the back to run and oil the shaft...but pot metal is not a very porous metal?

Original hole would be right about here:

image.thumb.png.1d802c1ae8ebfd0e32cc7c0918269a8a.png

The new housing has this recess area to capture the excess oil:

image.png.20c594377b057aebf4d749e9697fdb75.png

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I did check if the new gears can fit into the old housing...yes.  The tolerances for the steel printing is +/- 5%.  I made sure the fittings were snug and would allow the gears to smooth out during "breaking in".  I enlarged all parts by 2.5% to allow for polishing and breaking in.  I'd rather be over than under and the gears can be run in and will smooth out during "breaking in" process.  Again, I will order a set for me to try first before releasing.  The nose cone will need tapping for fitting the screws and threading for the oiler.  The long term goal is to be able to run the fan without running into pot metal issues.

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I've talked to Daniel O'Toole.  He tells me the whole front housing is self lubricating.  The grease gets up there and lubricates the shaft.  It makes sense.  I will remove the oiler and leave the hole for bushing.  This way, it leaves the look of the front housing.  All I'm doing is updating with modern materials.  I will rework the front cone without the oiler.

Thank you Daniel!

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I'll trust the original design.  The people who designed the housing must have known what they were doing.  I don't think they would have forgotten to add an oiler if it needed one.  I'll go ahead and keep the design and just update the material.

OR...I will update the front housing with both design.  I think Daniel is onto something.  No way would they forget to add an oiler if it needed one.  I will make both options available for the front housing.  One with an oiler and one without.

 

 

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On 9/25/2022 at 5:38 PM, Louis Luu said:

I'll trust the original design.  The people who designed the housing must have known what they were doing.  I don't think they would have forgotten to add an oiler if it needed one.  I'll go ahead and keep the design and just update the material.

OR...I will update the front housing with both design.  I think Daniel is onto something.  No way would they forget to add an oiler if it needed one.  I will make both options available for the front housing.  One with an oiler and one without.

 

 

I like the idea of having an additional oiler in the front, but I like the option for either with or without even better. For those that like the look of the original nose cone without the oiler they can get the version that looks like OEM. For those that want the option of the additional oiler they can get the upgrade. Having an oiler there wouldn't hurt anything, and even with the oiler one doesn't need to use it. It is interesting that grease works its way up to the front on these. I'm not familiar enough with mine to fully understand its inner workings, but I'm excited to try out some updated parts that hopefully will be stronger than the zinc pot metal used in the original. I hope my fan will last another 100 years. 

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On 9/26/2022 at 5:39 PM, Fred Summers said:

I like the idea of having an additional oiler in the front, but I like the option for either with or without even better. For those that like the look of the original nose cone without the oiler they can get the version that looks like OEM. For those that want the option of the additional oiler they can get the upgrade. Having an oiler there wouldn't hurt anything, and even with the oiler one doesn't need to use it. It is interesting that grease works its way up to the front on these. I'm not familiar enough with mine to fully understand its inner workings, but I'm excited to try out some updated parts that hopefully will be stronger than the zinc pot metal used in the original. I hope my fan will last another 100 years. 

The material is plenty strong.  I ordered a Diehl train badge for Bobby, he had one heck of a time polishing it.

 

Edited by Louis Luu
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