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Back Gear Pin & Rattle

 

I have 101.07301 Atlas / Craftsman lathe from the early 1940's.? I was using the back gear and noticed a rattle.? I'm uncertain which part of the back gear the noise is coming from.? Is anyone familiar with this problem?? Also when I tried to disengage the back gear I couldn't get the pin to go in.? I can move the pin so it's not seized.? Is the any trick to get the pin to seat in the front gear or do I need to take apart the spindle?

Jon
 

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Check for missing shims on the back gear mounting bolts to the headstock.?
Atlas has .002 & .003 in parts book.?


On Sep 5, 2023, at 10:55 PM, Jon Helig <jlhmnj@...> wrote:

?I have 101.07301 Atlas / Craftsman lathe from the early 1940's.? I was using the back gear and noticed a rattle.? I'm uncertain which part of the back gear the noise is coming from.? Is anyone familiar with this problem?? Also when I tried to disengage the back gear I couldn't get the pin to go in.? I can move the pin so it's not seized.? Is the any trick to get the pin to seat in the front gear or do I need to take apart the spindle?

Jon

 

Since we’re on this subject, my back gear slips out under load. What do I adjust to keep the over-center lever in? Thanks.

Jim
 

On 9/6/23 00:55, Jon Helig wrote:
I have 101.07301 Atlas / Craftsman lathe from the early
1940's.? I was using the back gear and noticed a rattle.?
I'm uncertain which part of the back gear the noise is
coming from.? Is anyone familiar with this problem?? Also
when I tried to disengage the back gear I couldn't get the
pin to go in.? I can move the pin so it's not seized.? Is
the any trick to get the pin to seat in the front gear or
do I need to take apart the spindle?
A common problem is that the bushings in the pulley get worn
when run without putting oil in the oil hole buried in the
bottom of one of the pulley grooves.

Jon
 

On 9/6/23 08:19, jf08056 via groups.io wrote:
Since we’re on this subject, my back gear slips out under
load. What do I adjust to keep the over-center lever in?
Thanks.
There may be shims under the bracket that holds the back
gear shaft.? Changing these changes the amount of gear
engagement of the back gears.? Also, there are supposed to
be wave washers on the ends of the eccentric shaft that
keeps it from moving under gear vibration.

Jon
 

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Two hints on this topic. If you use an abrasive cloth like emery of rouge paper, be sure to thoroughly clean the surface when you’re finished. They contain some kind of binder wax that doesn’t get along well with electric current and heat. If you do try to turn the armature be aware that turning copper requires a sharp tool and a negative rake. If the tool is not sharp it will mush the copper. If the rake is not negative (about 5 degrees in my experience) it will dig in.

?

Sent from for Windows

?
 

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Is there a reason for turning the armature (clearly i have no idea about motors?)?

From: [email protected] <[email protected]> on behalf of rfmarchi1 <rfmarchi@...>
Sent: Wednesday, September 6, 2023 12:23 PM
To: [email protected] <[email protected]>
Subject: Re: [atlas-craftsman IO] Back Gear Pin & Rattle
?

Two hints on this topic. If you use an abrasive cloth like emery of rouge paper, be sure to thoroughly clean the surface when you’re finished. They contain some kind of binder wax that doesn’t get along well with electric current and heat. If you do try to turn the armature be aware that turning copper requires a sharp tool and a negative rake. If the tool is not sharp it will mush the copper. If the rake is not negative (about 5 degrees in my experience) it will dig in.

?

Sent from for Windows

?
 

I was able to do the work with a mildly abrasive (supposedly diamond) nail care "tool." I knew about how gummy copper is, and that the old machinists used milk as a lubricant when turning parts made of copper, but the commutators weren't that badly scored or damaged. Dodged several bullets there, I think. ;)?

I blew the little bit of fluff and particulates I could see of them, and have the motors nearly reassembled, but due to an appointment cancelation, I think I'll pull them back apart and spray the commutators with electrical contact cleaner to wash off anything I may have missed. May run to Metals Supermarkets and see if I can find a stick of brass close to the right size... Just in case the brush caps I ordered don't fit. Though I have a stick of 5/8" Delrin impregnated with Teflon that I could use, and not have to travel or spend more money if I can find it. ;)

William R. Meyers, MSgt, USAF(Ret.)

Aphorisms to live by:
Good judgement comes from experience. Experience comes from bad judgement.?
SEMPER GUMBY!
Improvise, Adapt, and Overcome.
Physics doesn't care about your schedule.
The only reason I know anything is because I've done it wrong enough times to START to know better.
Expect in one hand, expectorate in the other. See which one gets full first.



On Wednesday, September 6, 2023 at 11:27:50 AM CDT, Andrei <calciu1@...> wrote:


Is there a reason for turning the armature (clearly i have no idea about motors?)?

From: [email protected] <[email protected]> on behalf of rfmarchi1 <rfmarchi@...>
Sent: Wednesday, September 6, 2023 12:23 PM
To: [email protected] <[email protected]>
Subject: Re: [atlas-craftsman IO] Back Gear Pin & Rattle
?

Two hints on this topic. If you use an abrasive cloth like emery of rouge paper, be sure to thoroughly clean the surface when you’re finished. They contain some kind of binder wax that doesn’t get along well with electric current and heat. If you do try to turn the armature be aware that turning copper requires a sharp tool and a negative rake. If the tool is not sharp it will mush the copper. If the rake is not negative (about 5 degrees in my experience) it will dig in.

?

Sent from for Windows

?
 

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Push comes to shove for testing a guy could make some caps that slide in the cap holes & hold them in with a hose clamp to test run the motor ,

animal

On 9/6/23 9:38 AM, Bill in OKC too via groups.io wrote:

IMay run to Metals Supermarkets and see if I can find a stick of brass close to the right size... Just in case the brush caps I ordered don't fit. Though I have a stick of 5/8" Delrin impregnated with Teflon that I could use, and not have to travel or spend more money if I can find it. ;)

William R. Meyers, MSgt, USAF(Ret.)


 

I've got caps from the tool post grinder that seem to fit well enough. Will be using that. But I want proper caps for long-term use. Not sure what the original caps are, just some sort of dark gray or black plastic. Could easily be ABS. The tool post caps are brass. One solid, cut from hex stock, the other a brass cap with a plastic overlay on the cap. Since those are exposed on the tool post grinders, I'm going to want them covered with plastic, too. The motors are 120V universal, so 120VDC or AC. I have a habit of putting my hand on the tool post, so I could see that biting me...

Bill in OKC

William R. Meyers, MSgt, USAF(Ret.)

Aphorisms to live by:
Good judgement comes from experience. Experience comes from bad judgement.?
SEMPER GUMBY!
Improvise, Adapt, and Overcome.
Physics doesn't care about your schedule.
The only reason I know anything is because I've done it wrong enough times to START to know better.
Expect in one hand, expectorate in the other. See which one gets full first.



On Wednesday, September 6, 2023 at 01:03:10 PM CDT, mike allen <animal@...> wrote:


Push comes to shove for testing a guy could make some caps that slide in the cap holes & hold them in with a hose clamp to test run the motor ,

animal

On 9/6/23 9:38 AM, Bill in OKC too via groups.io wrote:
IMay run to Metals Supermarkets and see if I can find a stick of brass close to the right size... Just in case the brush caps I ordered don't fit. Though I have a stick of 5/8" Delrin impregnated with Teflon that I could use, and not have to travel or spend more money if I can find it. ;)

William R. Meyers, MSgt, USAF(Ret.)


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