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GE Collar Gear CAD


Louis Luu
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I will be ordering two sets of steel types.  One is softer but would allow some flex while the other is stronger but also more brittle...need to find the right balance.  This will also allow me to check for shrinkage before finalizing project.  Projected time is end of November...can't really rush testing.  Again, the goal is to prove the gears are a viable option for a bunch of fans missing gears or have stripped gears.

I've talked with several people who have told me printed steel gears will not work.  Like most technology, it is just a matter of time.  If you don't try it, how will you know?  I'm not saying technology will solve all problems but it is worth investigating.

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I wouldn't quite trust the original design with this,  since they thought the shaft running directly in pot was an OK design.  But having the option will be good,   the oil permeable bushings should be fine without an oiler, but looking at GE's design over the years,  they added oilers to most of the rear bearings,  so having the option would be good,

If Bronze is an option for printing, that might also be a good option,  its harder than the original brass, but not as tough as the stainless,   But these gears aren't under super tough condition,  they mainly are for speed reduction,  not for torque increase.  

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Just to give some ideas on how strong the stainless steel is....this is stainless steel 316 which is the weaker of the two steel.  Stainless steel 317 is much stronger.

 

 

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I SEE A DRASTIC PRICE DIFFERENCE!!!  Only downside is they don't ship.  That would mean I need to order them and have them ship out.  Again...I huge price difference.  I will need to further investigate.

 

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I will go ahead and order my parts through this new company and give it a try.  Their turn around time is 72 hours.

I will need to recalculate all my parts due to data file size restrictions.  That will probably take about a day for me to work out the math and for the computer to crunch the numbers.

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19 minutes ago, Fred Summers said:

I’m excited to see how it turns out. So this isn’t Shapeways? 

No, not Shapeways.  I am working on reducing the file size and will submit for print this weekend.  Luckily, the turnaround time is relatively fast.  Only downside is I will have to ship them out.

Edited by Louis Luu
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Ordering from both company to compare quality.  Shapeway just approved the metal printing and is processing right now.  The order from the other company should be approved by tomorrow.

 

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On 8/7/2022 at 7:23 PM, Thomas Peters said:

Perhaps this might be called a good design, with poor execution?

Good design, good execution, poor choice in materials

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24 minutes ago, Ed Frank said:

Good design, good execution, poor choice in materials

Agree.  The more I study it, the more I like it.  The design is very good.  

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1 minute ago, Louis Luu said:

Agree.  The more I study it, the more I like it.  The design is very good.  

Absolutely. I've restored a few of these. The design is good, the execution of the gears (when in the right place and made of the right material) is good. If they had made the nose cone  out of cast iron, and the gears out of brass, I would venture to guess this would have been a more than 1 year production fan. Just my opinion.

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Just got done ordering from the new company.  I should have them within a week.  Shapeways takes a tad bit longer.  I will post pictures once I get the parts.

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Gears and nose cone from the new printing company is completed and being shipped.  I will take pictures when they get here and give them a try.  Shapeways will take 3 more weeks.

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Can you share what 3D printing technology is being used to make these parts? (Direct metal lasering (DML), selective metal sintering/melting (SLS/SLM), binder jetting, etc.

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46 minutes ago, Fred Summers said:

Can you share what 3D printing technology is being used to make these parts? (Direct metal lasering (DML), selective metal sintering/melting (SLS/SLM), binder jetting, etc.

SLM technology for steel 316 and 317.  Casting is done with binder jet low resolution to melt away the plastic for casting.

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I'll be receiving the collar and gears from the new company on 10-19-2022.  Will post pictures.  Laser sintering can be tricky so I will have to see how good the gears are.  I know Shapeway does a good job with laser sintering but not sure about the new company.

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Collar parts arriving from the new company today.  Worst case scenerio, the gears won't printed correct.  I know Shapeway will come through though with the gears.

It is the nose cone I'm really interested in from the new company.  This is the most expensive part.  It should be large enough for them not to mess it up?  Will post some pictures when I get home.

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Just got the pieces from the new company....absolutely amazing.  The gears are very strong.  I will need to make slight adjustments to minimize machining...adjust hole aperture.  This was due to my fault...I had very narrow tolerance because I did not want loose fittings.  I will check all measurements this weekend and make the necessary modification.  The nose cone fits like a glove onto the motor.  I need to invest in a tumbler for the gears and throw them in there to smooth them out...break them in.  The teeth is extremely strong.  Gears can be printed and will work.  This answers one my of questions.  The next goal will be to make press plates for badges.

 

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Edited by Louis Luu
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I need to still wait for Shapeways to arrive.  Afterwards, all adjustments will be made.  Parts are much easier to draw when you have the objects in front of you.  Sometimes, seeing on the monitor screen is not the same as having in front of you.  I am still in awe.  This gives me hope for the mini-lollipop project!  I have a few ideas for the commutator and center bearings...will most likely just draw them from the original and shrink it to fit.  Thanks Giving and Christmas time is when I am off and can do some clear thinking.  The DeMott motor was conceived during this period of time last year.

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