Author Topic: Is this a recoverable error?  (Read 3339 times)

Offline matthew-s

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Is this a recoverable error?
« on: February 24, 2018, 08:18:04 PM »
I started on the Kozo A3 two months ago.

I was minutes from finishing my last render axle, and screwed up.

The axle for the wheel should have been 0.3125 diameter. I cut it to 0.310. What are my options? The plans called for 0.3120 to 0.3125.

1.  Do nothing. The locktite will fix it
2.  Use a punch and raise a few burrs then glue it.
3.  Make another one

I just placed a big order of metal for the next step. Im trying to avoid ordering a single axle.

Online crueby

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Re: Is this a recoverable error?
« Reply #1 on: February 24, 2018, 08:26:07 PM »
Did you already make the wheels? If not, drill them to match the smaller size on the one axle.
If so, you could turn the end of the axle down a bit more and add a short bushing piece on the end to thicken it up again, turn that to proper size to fit the wheel. Or, plug the hole in two wheels, and rebore them to the smaller size.

Offline matthew-s

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Re: Is this a recoverable error?
« Reply #2 on: February 24, 2018, 08:28:13 PM »
Wheels are made. Reamed to 0.3125.

Offline Dave Otto

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Re: Is this a recoverable error?
« Reply #3 on: February 24, 2018, 08:34:19 PM »
Mistakes happen, I would make a new axle.

Dave

Offline matthew-s

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Re: Is this a recoverable error?
« Reply #4 on: February 24, 2018, 08:42:12 PM »
Yeah. Weird. I made three perfect ones, ruined my fourth, then ruined my spare. I was so looking forward to finishing this stage this weekend.

Offline Zephyrin

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Re: Is this a recoverable error?
« Reply #5 on: February 24, 2018, 10:22:19 PM »
I would turn a new axle, the simplest solution.  the spoiled one will be useful, one day...
raising burrs or knurling is not for loco wheels, I did that for fixing steam toys !

Offline Doc

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Re: Is this a recoverable error?
« Reply #6 on: February 24, 2018, 11:01:52 PM »
The green not sure of the number it is a permanent loctite  is capable of locking parts with a much larger gap than .001 so just loctite it and let cure be sure to clean both parts real good before hand. A fit of .0005 to .001 will yield a stronger fit than a .0005 press fit on small parts.

Offline b.lindsey

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Re: Is this a recoverable error?
« Reply #7 on: February 24, 2018, 11:10:18 PM »
Matthew, I don't think you will be happy with anything less than a new axle.

Bill

Online crueby

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Re: Is this a recoverable error?
« Reply #8 on: February 24, 2018, 11:48:44 PM »
I had the same error on my Shay build, only it was the hole in the one wheel that was too large. Fortunately it was only in one, the spare. So, that one became the demo wheel that I can show people how it was pieced up. I did toy with the idea of mounting it on the back of the tender, like a giant spare truck tire!

Offline Doc

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Re: Is this a recoverable error?
« Reply #9 on: February 24, 2018, 11:51:38 PM »
Mat
Take a look at this page this is what we use where I work I can tell you it is true when they say it has a 4000 shear strength. And it will work with up to .015 gap


Loctite retaining compound strength.

Offline matthew-s

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Re: Is this a recoverable error?
« Reply #10 on: February 24, 2018, 11:55:02 PM »
Thanks. I guess I’m placing another order and making another one. The gap is .0025, so too big for these adhesive solutions.

Makes me cranky as I really thought the end was in sight. Took 2 months to just get this far!  :Mad:

Offline Doc

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Re: Is this a recoverable error?
« Reply #11 on: February 25, 2018, 12:21:58 AM »
The 680 will go all the way to a .015 a .002 or .003 is nothing to it.

Offline matthew-s

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Re: Is this a recoverable error?
« Reply #12 on: February 25, 2018, 12:32:33 AM »
The 680 will go all the way to a .015 a .002 or .003 is nothing to it.

Ah. I read that too quickly. That is 10x bigger than how I read it. I’ll keep it in mind!

Offline stevehuckss396

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Re: Is this a recoverable error?
« Reply #13 on: February 25, 2018, 12:35:58 AM »
I have in the past knurled a diameter to gain a thou and then press and locktite the parts together. They are still together.
Do not be like the cat who wanted a fish but was afraid to get his paws wet.

Offline picks27t

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Re: Is this a recoverable error?
« Reply #14 on: February 25, 2018, 12:44:01 AM »
That is good to know Doc


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