My feed rate gearing is set at 0.0035" and I comfirmed that last night.? I was turning some stainless with a carbide index cutter and the finish was awful.? As a novice I'm still learning my metals and cutting rates, so it is an experiment half them time.? But I'm learning to pay attention to the cutting rate tables.? Anywhoo.

I wanted to reduce the feed to the slowest rate (Is it 0.00187?) and pulled out the MOLO and looked at the gear chart.? This would've been the first time I've changed gears since getting the rebuild done last year or so.? The figure of the gear arrangement showed 3 gears on the banjo.? Well I only have 2 bolts to hold the gear on.

I put the gears back in the position they were in when I first got the lathe from my dad, so never noticed I'm missing a gear bolt till last night.

The gear bolts have a thicker head on them versus a carriage bolt, will I be OK using a carriage bolt??
I don't see why not since there isn't tension on the fastener.

Just want to see if you guys thought that was OK.? I don't even know if you can find a bolt like the one on the lathe.
Thanks,
Jody

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From: [email protected] [mailto:[email protected]] On Behalf Of Jody
Sent: 28 January 2019 08:12 PM
To: [email protected]
Subject: [atlas-craftsman IO] Missing Feed Gear Bolt

?

My feed rate gearing is set at 0.0035" and I comfirmed that last night.? I was turning some stainless with a carbide index cutter and the finish was awful.? As a novice I'm still learning my metals and cutting rates, so it is an experiment half them time.? But I'm learning to pay attention to the cutting rate tables.? Anywhoo.

I wanted to reduce the feed to the slowest rate (Is it 0.00187?) and pulled out the MOLO and looked at the gear chart.? This would've been the first time I've changed gears since getting the rebuild done last year or so.? The figure of the gear arrangement showed 3 gears on the banjo.? Well I only have 2 bolts to hold the gear on.

I put the gears back in the position they were in when I first got the lathe from my dad, so never noticed I'm missing a gear bolt till last night.

The gear bolts have a thicker head on them versus a carriage bolt, will I be OK using a carriage bolt??
I don't see why not since there isn't tension on the fastener.

Just want to see if you guys thought that was OK.? I don't even know if you can find a bolt like the one on the lathe.
Thanks,
Jody

Is the 618’s serial number 023653 or 028653?

Robert Downs

*From:*[email protected] [mailto:[email protected]] *On
Behalf Of *Don Newbold
*Sent:* Wednesday, January 23, 2019 11:14
*To:* [email protected]
*Subject:* Re: [atlas-craftsman IO] Welcome to [email protected]

Thanks for the warm welcome.

Here are a couple photos of their current condition.
The Atlas is complete and well oiled.
The Sears is covered in saw dust as it had been sitting in a wood shop
for years. There is no id plate, neither on the end nor the back. It is
complete except for a motor.
Both are sitting covered as I try to convert a 50x6 room along the front
of my house from a greenhouse to shop space.

Don


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?

Robert,

-------- Original message --------
From: "Robert Downs via Groups.Io" <wa5cab@...>
Date: 1/27/19 2:14 AM (GMT-06:00)
To: [email protected]
Subject: Re: [atlas-craftsman IO] Concern with my Spindle

I seriously doubt that how well the dust covers seal around the spindle has anything to do with oil flow rate.? In the first place, the dust covers don’t come anywhere close to actually sealing to the spindle.? However, they could be blocking the hole in the top of the headstock.? I have suspected for years that that is the reason for the large imbalance on my 3996.?

?

Are the felts in your oil cups factory or not?? If not, then none of us have any basis for comparison.? I don’t mean to imply that there is automatically something wrong in using locally procured felt.? Just that there would be no basis for comparison.

?

Robert Downs

?

?

…

?

I'm guessing the oil loss differential from the front to back bearings has to do with the metal dust caps sealing better on one end.

I'm curious if other's oil cups are empty on the spindle each time they use it?
Thanks,
Jody

Yeah. But instead of today someone going to the trouble to convert a
babbit headstock to some automotive split rod bearings, it would be
quicker and cheaper to pick up a Timken bearing headstock and spindle
and transfer the rest of the parts to it.

Also, the 9”, 10” and 6” were not originally intended for hobbyists.? Although they cost less than the Clausing and South Bend lathes, they still cost more than a weeks pay for most US residents.? The hobby market didn’t take off until after WW-II when people began to have a little extra cash each week.? The only private individuals who could afford one during the Depression were rich ones primarily in the North East.? And during WW-II, even they couldn’t buy one unless they bribed some official.

?

?

Yeah.? But instead of today someone going to the trouble to convert a babbit headstock to some automotive split rod bearings, it would be quicker and cheaper to pick up a Timken bearing headstock and spindle and transfer the rest of the parts to it.

?

Robert Downs

?

?

Robert, you pose a very interesting question here. Other than
basic conservationism on the part of customers and producers I do not
see why! But then the basic design of our lathes was done in an era when
Chevrolet still had poured babbitt connecting rod bearings! This would
be a thought for upgrading an older poured babbitt headstock with a
larger spindle, bigger through hole and trimetal insert bearings! Bill
in Boulder

On 1/26/19 11:57 AM, Robert Downs via Groups.Io wrote:

They are similar to the bearings used in most automotive and aircraft
engines except that most of those built since sometime between 1900
and 1920 have replaceable steel backed bearing halves.? Why Atlas,
South Bend and many other makers didn’t do that, I don’t know.

?

I have one of those in my 53 Chevy Advance Design truck. ? A marvel of Rube Goldberg style engineering. ? There is another intermediate style of shell bearing as used on my 47 Allis Chalmers tractor. ?It has a very thick babbitt layer. ?You have to shim them. As they wear you remove shims. ?

?

Robert, you pose a very interesting question here. Other than
basic conservationism on the part of customers and producers I do not
see why! But then the basic design of our lathes was done in an era when
Chevrolet still had poured babbitt connecting rod bearings! This would
be a thought for upgrading an older poured babbitt headstock with a
larger spindle, bigger through hole and trimetal insert bearings! Bill
in Boulder

On 1/26/19 11:57 AM, Robert Downs via Groups.Io wrote:

They are similar to the bearings used in most automotive and aircraft
engines except that most of those built since sometime between 1900
and 1920 have replaceable steel backed bearing halves.? Why Atlas,
South Bend and many other makers didn’t do that, I don’t know.

?

Robert, you pose a very interesting question here. Other than
basic conservationism on the part of customers and producers I do not
see why! But then the basic design of our lathes was done in an era when
Chevrolet still had poured babbitt connecting rod bearings! This would
be a thought for upgrading an older poured babbitt headstock with a
larger spindle, bigger through hole and trimetal insert bearings! Bill
in Boulder

On 1/26/19 11:57 AM, Robert Downs via Groups.Io wrote:

They are similar to the bearings used in most automotive and aircraft
engines except that most of those built since sometime between 1900
and 1920 have replaceable steel backed bearing halves.? Why Atlas,
South Bend and many other makers didn’t do that, I don’t know.

?

?

?from what i read? the atlas came out with timkens first and sears wanted to keep the price down and stuck with bushings unless ordered with timkens... the 618 was prmarily a hobby lathe but also was marketed to service repair shops to re surface armatures in starters and generators..