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Farmer John

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Reply with quote  #1 
I have made many aluminum Friction Pulleys by destructive machining, and recently came across Shape Ways plastic pulley, made by the  constructive process, 3D printing,.....and for only $5.  I had to take a look at these.  The concentricity is good, but the hole for the motor shaft measures .265, and needs to be opened up to .275.  Also the roll pin hole, which measures .067, needs to be opened up to .086.  I wouldn't recommend enlarging the holes with a Black and Decker, or recommend using a twist drill in a drill press.  Not many folks will be willing to buy a $25 reamer to ream one hole in a $5 part.
     At the recent Wi/Il gathering, held by Mrs. D, Miriam was kind enough to leave five, yes, five distressed Elna machines for rehoming.  The Elna Transforma is the ideal platform  upon which to install the plastic pulley, since the Bakelite/rubber pulley on the Transforma has upon it three flats...the machine sounding like a jack hammer...REALLY.  The handwheel has been removed, the pulley roll pin removed, the base of the sm removed, and the roll pin removed from the horizontal knee bar.  All that remains is for me to withdraw the knee bar, reposition the motor to allow the pulley swap and reassemble.  I need three hands for this.  Stay tuned for the results.

Something has changed, I can no longer attach a photo

John
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Zorba

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Reply with quote  #2 
Very interested in this - hopefully your picture posting woes will cease soon!
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Miriam

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Reply with quote  #3 
John, I’m so glad those fine machines are now in good hands.
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Farmer John

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Reply with quote  #4 
Yes, Mariam, a couple Elna sm went 500 miles away, with me taking what was left over, ha, ha.  The trouble is that I can't stand to have a sm around here that is inoperative.....I have the burning urge to fix them, and I don't need more Elna's for myself.  Luckily, I already have a request for one of your Supermatic's from a sewing group member, so I have fun fixing one, and off it will go, "Pay it Forward".  Shall I get a Supermatic operating for return to you ??

I can't attach photos now, while I had no problems in the past.  My attempts result in an "Alert" dialog box, stating that the photo could not attach due to an HTTP error.  Someone please, HELP ME.......photo files are jpeg.  Neither "attach files" nor Insert Photos" will function.
Farmer John
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Zorba

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Reply with quote  #5 
Have you tried another browser? Push comes to shove, PM me for my email, I'll post 'em for ya.
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Farmer John

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Reply with quote  #6 
Today, I swapped out the OEM friction pulley for the plastic Shape Ways pulley.  As I removed the kneebar, I was pushing it out with an 8 inch long 1/8 inch diameter steel rod, which I left in place.  The rod retains the washers that are on either side of the motor mount.  That slight difference in diameters gave enough movement to the motor to slide the old pulley off of the motor shaft and slide on the new one.  Sliding the knee bar back in place displaced the 1/8 inch rod.  Next was to replace the two roll pins, and screw on the base plate.  That 1/8 inch rod was my third hand to hold those washers in place.  The operation is easier to do than explain.  Winding a bobbin, threading the machine, and sewing a test piece with tension adjustments, completed the repair.
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Zorba

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Reply with quote  #7 
Photos from Farmer John:

Shape Ways friction Pulley, ready to install
100_1743.jpg 


OEM Pulley with large flat spot:
100_1744.jpg 


Line of stitches after assembly of machine:
100_1745.jpg 



New Friction pulley installed:
100_1746.jpg



Center of Photo - Drilled & tapped the end frame so that the motor can be pushed away from the friction pulley.
  100_1748.jpg 


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OurWorkbench

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Reply with quote  #8 
Thank you!!

Janey

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