Singer Potted Motor converted to a treadle, HC or motor TUTORIAL
04-08-2014, 07:46 PM
#41
Super Member
Join Date: Aug 2013
Location: Springfield Oregon
Posts: 1,481
I pulled the needle plate screws on a 201, and I get #8-40.
Here is a picture of some tools used with threading.
[ATTACH=CONFIG]470785[/ATTACH] From the left is a die handle, for cutting or cleaning (chasing) threads for a screw. 2nd is a die for the same. 3rd and above it are tap holders, which hold the 2 packaged items. The red/white package is an 8-32 tap, pretty common, except on sewing machines. The yellow/green package is a #1 easy out, which needs a hole at least 5/64" (between 1/16 and 3/32") The tip of it would probably hit the interfering part before it gained any purchase on the bushing. Between the 2 packages is a thread guage, this one for metric fasteners. Taps and easy outs are a couple bucks a piece. The thread guage, maybe $7 or 10?
Machine screws have a defined outside diameter, what mostly varies is the number of threads per inch. (TPI) So a 6-32 screw has an outside diameter of (6 x .019) + .062= .176". It has 32 threads (teeth) per inch.
Hope this wasn't too boring!
So now chasing threads has another meaning for ya
Here is a picture of some tools used with threading.
[ATTACH=CONFIG]470785[/ATTACH] From the left is a die handle, for cutting or cleaning (chasing) threads for a screw. 2nd is a die for the same. 3rd and above it are tap holders, which hold the 2 packaged items. The red/white package is an 8-32 tap, pretty common, except on sewing machines. The yellow/green package is a #1 easy out, which needs a hole at least 5/64" (between 1/16 and 3/32") The tip of it would probably hit the interfering part before it gained any purchase on the bushing. Between the 2 packages is a thread guage, this one for metric fasteners. Taps and easy outs are a couple bucks a piece. The thread guage, maybe $7 or 10?
Machine screws have a defined outside diameter, what mostly varies is the number of threads per inch. (TPI) So a 6-32 screw has an outside diameter of (6 x .019) + .062= .176". It has 32 threads (teeth) per inch.
Hope this wasn't too boring!
So now chasing threads has another meaning for ya
Last edited by oldsewnsew; 04-08-2014 at 07:48 PM. Reason: hindsight is 20-20
04-09-2014, 05:22 AM
#42
Super Member
Join Date: Aug 2013
Location: Springfield Oregon
Posts: 1,481
Correction to #41 oops
"So a 6-32 screw has an outside diameter of (6 x .019) + .062= .176" "
Actually it's .062 + (.013 x screw number)= diameter on the outside of the screw threads. Hence
one of many online screw size charts
http://lelandpowell.com/metric.htm
I'm all through now, the audience has left the room, except for one old guy sleeping in the front row...
Actually it's .062 + (.013 x screw number)= diameter on the outside of the screw threads. Hence
one of many online screw size charts
http://lelandpowell.com/metric.htm
I'm all through now, the audience has left the room, except for one old guy sleeping in the front row...
04-09-2014, 07:21 AM
#43
Super Member
Join Date: Feb 2012
Posts: 8,091
"So a 6-32 screw has an outside diameter of (6 x .019) + .062= .176" "
Actually it's .062 + (.013 x screw number)= diameter on the outside of the screw threads. Hence
one of many online screw size charts
http://lelandpowell.com/metric.htm
I'm all through now, the audience has left the room, except for one old guy sleeping in the front row...
Actually it's .062 + (.013 x screw number)= diameter on the outside of the screw threads. Hence
one of many online screw size charts
http://lelandpowell.com/metric.htm
I'm all through now, the audience has left the room, except for one old guy sleeping in the front row...
Thanks for the info on how to figure out the screw sizes. I always wondered how they did that.
Joe
04-09-2014, 11:52 PM
#46
Power Poster
Thread Starter
Join Date: Mar 2011
Location: Somewhere
Posts: 15,506
Thanks Miriam. If it came off of a Singer 66, it must be a 9-spoke. I don’t think they ever put a 6-spoke balance wheel on the model 66.
The reason that I asked, is because the 6-spoke wheels that I’ve come up with all seemed to have a deeper hub than the 9-spoke. I think that my 6-spoke wheels have all come from model 27 machines.
I’ve not ever converted a potted motor machine (201-2 or 15-91) to handcrank, and I wondered if the collars on them would require the deeper hub for the Stop Motion Washer to fit correctly. Apparently not.
I’m getting overrun with 15-91s (they’re very common here - I have 10 and have turned down others), nearly all of them need re-wired, and I might want to begin converting some to hand or treadle use.
CD in Oklahoma
The reason that I asked, is because the 6-spoke wheels that I’ve come up with all seemed to have a deeper hub than the 9-spoke. I think that my 6-spoke wheels have all come from model 27 machines.
I’ve not ever converted a potted motor machine (201-2 or 15-91) to handcrank, and I wondered if the collars on them would require the deeper hub for the Stop Motion Washer to fit correctly. Apparently not.
I’m getting overrun with 15-91s (they’re very common here - I have 10 and have turned down others), nearly all of them need re-wired, and I might want to begin converting some to hand or treadle use.
CD in Oklahoma
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