delta rockwell 11" metal lathe

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chucksue
Posts: 7
Joined: Sun Jul 12, 2015 11:31 am

delta rockwell 11" metal lathe

Postby chucksue » Sat Mar 18, 2017 8:44 am

I am looking for the 48 tooth gears in the gear train that change the threading speeds.I have no number on the lathe.

earlgo
Posts: 952
Joined: Sat Jan 29, 2011 11:38 am
Location: NE Ohio

Re: delta rockwell 11" metal lathe

Postby earlgo » Sat Mar 18, 2017 10:02 am

chucksue:
If you have other gears that are in the set you need to measure the bore, and determine the diametral pitch of the gears. Most, but not all for the smaller lathes are 16 DP 14 1/2 PA (pressure angle).
Then look at the Boston Gear Catalog and find the gear(s) you need in the 'change gear' section.
Boston gear catalog 12.pdf
(92.29 KiB) Downloaded 18 times

I did this for the Atlas and got a couple of 20T gears and they work as expected and were not too expensive, around $20. A 28 tooth gear was quoted at $36 so your 44 T will be more. I got mine from a local distributer as BG doesn't sell to the hoi polloi.
The important thing is to find out the bore, tooth thickness and diametral pitch before you order from BG or e-bay.
Hope this helps.
--earlgo

chucksue
Posts: 7
Joined: Sun Jul 12, 2015 11:31 am

Re: delta rockwell 11" metal lathe

Postby chucksue » Sun Mar 19, 2017 8:08 pm

The bore is 5/8. I read about the pitch and pressure. I have no gauges but I think I can compare them with the pictures on the net. I have a machine shop real close and they probably have gauges.
I will keep in touch. I know I will have more questions. thank you

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wlw-19958
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Location: Lewes, DE

Re: delta rockwell 11" metal lathe

Postby wlw-19958 » Sun Mar 19, 2017 9:55 pm

Hi There,

IIRC, take the number of teeth the gear has, add 2
to that number and then divide by the outside diameter.
This should give you the diametral pitch of the gear.
Pressure angle is something you will need a gauge to
check.

Good Luck!
-Blue Chips-
Webb

spro
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Joined: Mon Feb 20, 2006 11:04 pm
Location: mid atlantic

Re: delta rockwell 11" metal lathe

Postby spro » Mon Mar 20, 2017 4:10 pm

You guys nailed it for chucksue. The gear is 3 1/8" OD. 48t +2 =50 so it is 16dp and does measure to 14 1/2pa.
I have two gears for this. One can be on the stud and the other is this gearbox drive. One of them has cast #s which may help. MC L1 76(orG).
the gear is 1/2" wide at the hub and teeth.

spro
Posts: 6197
Joined: Mon Feb 20, 2006 11:04 pm
Location: mid atlantic

Re: delta rockwell 11" metal lathe

Postby spro » Mon Mar 20, 2017 7:34 pm

Many of these Rockwells are to gov't spec using different features. One example is www//ebay152118758114 .

chucksue
Posts: 7
Joined: Sun Jul 12, 2015 11:31 am

Re: delta rockwell 11" metal lathe

Postby chucksue » Mon Mar 20, 2017 8:27 pm

Looked at the one on eBay. looks like mine. Thank you Blue Chips!
Thanks to everyone. Now it is just a matter of time getting the gears.
I have had the lathe for 30 years. Never could cut gears. 30 years ago I had no means of getting information.Today I do.

spro
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Joined: Mon Feb 20, 2006 11:04 pm
Location: mid atlantic

Re: delta rockwell 11" metal lathe

Postby spro » Mon Mar 20, 2017 8:39 pm

Thirty years slips by so quick. Politics, termites and rust doesn't. Glad we helped. :)

chucksue
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Joined: Sun Jul 12, 2015 11:31 am

Re: delta rockwell 11" metal lathe

Postby chucksue » Tue Mar 21, 2017 1:46 pm

I checked all the gears for there DP and they all are 16DP.

spro
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Joined: Mon Feb 20, 2006 11:04 pm
Location: mid atlantic

Re: delta rockwell 11" metal lathe

Postby spro » Wed Mar 22, 2017 6:52 pm

There are some differences between the earlier Delta Rockwell and the later ones. There are two different parts manuals. The earlier are s/n 138-9100 + BELOW #1513 and the later ones.
With the gears, they are spacers too. Both my 48T are on the GB drive and one is a spacer. When I use 48T, the 24T is a spacer. Normal stuff.

spro
Posts: 6197
Joined: Mon Feb 20, 2006 11:04 pm
Location: mid atlantic

Re: delta rockwell 11" metal lathe

Postby spro » Wed Mar 22, 2017 10:51 pm

I don't mean to go on about this one lathe but there are at least 4 different under drive benches for them. There were 3 types of spindles and "packages" included in the spec for different applications. Some were 5C and the closure was there( may not have collets) Some were threaded spindle, "American short taper" and many were long taper L00 . Many were equipped with taper attachment and metric transposing gears and Jacobs collet chucks.
It seems many were gov't spec for use in repair ,recovery trucks and other vessels for our Military at that time.
Looking at the plates/emblems of many, one can see the Federal specs and differences. Where they went, what built for... I suppose I am just rambling now. It isn't a big deal now. If not for South Bend keeping records, users/owners would not know where and to what their S. B.lathe with an "anchor" stamp and a s/n saw.

chucksue
Posts: 7
Joined: Sun Jul 12, 2015 11:31 am

Re: delta rockwell 11" metal lathe

Postby chucksue » Thu Mar 23, 2017 6:58 pm

How do you post a picture on this forum?


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