Jump to content

Watchmakers Lathe Motor Pulley Slipping


JBerry

Recommended Posts

Hey folks,

I recently purchased an 8mm Star watchmakers Lathe and a cheap chinese YDK Sewing Machine Motor to power it from eBay.

Regardless of the tension I put on the 4mm belt, the belt slips over the motor pulley and fails to turn the headstock.

Can anyone think of an easy fix to this problem? or a suitable pulley for this motor and a 4mm belt (the shaft onto which the pulley fits is 6.35mm in diameter)
If only I had a functional lathe to turn the pulley ;)

Thanks in advance!

 

 

Link to comment
Share on other sites

Keeping the motor between my legs and using the foot switch to turn it on and off, I turned the V a bit deeper with a graver. Still not a great deal of purchase, very little torque and a lot of slipping...

Anyone know where to source a more appropriate pulley?

Link to comment
Share on other sites

When I was an apprentice antique restorer way back in the 60's and machines being used were made in the 40's we used to use Pine resin for slipping belts. It was left to dry and then crushed to a rough powder, worked a treat on leather belts, not sure how it would go on today's synthetic belts though.  

  • Like 1
Link to comment
Share on other sites

5 hours ago, JBerry said:

Anyone know where to source a more appropriate pulley?

Well.....since I was so bullish on you getting the Star, I'm feeling bad its not yet working.....I'll make you a pulley if you like.  One time offer, I am not going into pulley business lol.   You have to supply a good dimensioned drawing of exactly what you want and postage.

  • Like 1
  • Thanks 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.



  • Recently Browsing

    • No registered users viewing this page.
  • Topics

  • Posts

    • that band is old as stated, there is a kit that pops up from time to time on selling sites for the repair of these type bands, some of this type are adjustable on a few links, one adjustable type allows you to align the round opening in the expansion slit [like yours] with the rivet to separate, but if yours won't come out then the rivet head is too big and will have to be done with some rivet removal and replacement, I suppose if you could make/optain the correct rivets that one could alter the said band, the tops/caps do lift off after raising the tabs....  
    • This is a watch from a friend who sent it to a neighborhood watchmaker for a battery change. It came back with the watch stem in a ziplock bag and the dial skewed 20°. The watchmaker told him that the stem was faulty and the watch cannot be repaired. I opened up the watch and found that one dial foot was broken off and still stuck in the movement, while the other was bent until it was flat against the dial. The stem could be inserted but it couldn't be pulled out to quickset and time adjusting positions. I did a full disassemble, cleaned and oiled the movement. But when it put in the battery, the second hand runs super fast. Like it gains 30 mins every hour. Any advice on fixing this problem? TIA.
    • I determined that the balance staff is rotating, not the roller table, so my second attempt at riveting was unsuccessful. I have ordered a new balance staff and will take measurements when it arrives. The balance staff i originally ordered (and now reordered) was specified as: Replacement balance staff: (A. Schild Caliber 984 1002 1021 1124 Original Balance Staff Part 723) so it should be correct. Measurements: (see pic below for terminology) xxxyy is a place holder until the new balance staff arrives. Lower pivot: Old - .08 mm New - xxxyy Lower pivot to balance seat: Old - 1.53 mm New - xxxyy Roller shoulder: Old - .42 mm New - xxxyy Hub: Old - xxxyy New - xxxyy Balance shoulder: Old - .86 mm New - xxxyy Collet shoulder: Old - .56 mm New - xxxyy Upper pivot: Old - broken New - xxxyy
    • Hello and welcome from Leeds.  We're here to help. 
    • I was just about to adk that, probably they have unnecessary waiting lists to make their watches appear more exclusive than they actually are.
×
×
  • Create New...