Series I Bridgeport will not change speeds
Close
Login to Your Account
Results 1 to 8 of 8
  1. #1
    Join Date
    Jul 2019
    Country
    UNITED STATES
    State/Province
    Washington
    Posts
    43
    Post Thanks / Like
    Likes (Given)
    1
    Likes (Received)
    2

    Default Series I Bridgeport will not change speeds

    Hello all. I recently acquired a Series I Bridgeport which has a broken belt. I have read the manual, read through various forum postings and watched the videos. In all they say to run the motor down to its lowest speed, however I have noticed that turning the hand wheel has no effect on the speed of the motor (up or down). Additionally, all of the instruction is to use 2 of the lower cover bolts to compress the spring, however since the speed won't change the spring remains extended which will not allow me to get the bolts in.

    Before I take it apart, is there anything I should be aware of? The HW video is pretty comprehensive concerning the top end tear down although I haven't looked at reassembly too hard yet.

    Thanks in advance

  2. #2
    Join Date
    Dec 2017
    Country
    UNITED STATES
    State/Province
    New York
    Posts
    134
    Post Thanks / Like
    Likes (Given)
    22
    Likes (Received)
    56

    Default

    You can use a couple longer bolts or some all thread to compress the spring. But, since the belt is broken, you shouldn't have an issue just pulling the motor straight out. The belt is only an issue when it's intact and makes it hard to pull the motor out.

    Ted

  3. Likes Richard King, Newman109 liked this post
  4. #3
    Join Date
    Sep 2009
    Location
    Phoenix,AZ
    Posts
    1,728
    Post Thanks / Like
    Likes (Given)
    2647
    Likes (Received)
    431

    Default

    You can not change speeds with the broken belt ! Use longer bolts or better yet pieces of all thread with nuts to compress the spring.

  5. Likes HWElecRepair liked this post
  6. #4
    Join Date
    Jul 2019
    Country
    UNITED STATES
    State/Province
    Washington
    Posts
    43
    Post Thanks / Like
    Likes (Given)
    1
    Likes (Received)
    2

    Default

    Thank you for the quick responses, I will do as suggested, I think I saw the threads were 10-32.

  7. #5
    Join Date
    Jul 2010
    Location
    Rochester, NY USA
    Posts
    2,155
    Post Thanks / Like
    Likes (Given)
    10
    Likes (Received)
    501

    Default

    Since this is a new to you machine, you should look over the condition of the keys in the Varispeed.
    The first clue is if the holes for the bolts to compress the spring don't line up with the threads in the other half of the pulley.

  8. #6
    Join Date
    Jul 2019
    Country
    UNITED STATES
    State/Province
    Washington
    Posts
    43
    Post Thanks / Like
    Likes (Given)
    1
    Likes (Received)
    2

    Default

    They lined up ok, I used all tread and some nuts. Got the top half basically apart, now working on the timing belt. Its dirty in there but seems to be in decent condition.

  9. #7
    Join Date
    Dec 2017
    Country
    UNITED STATES
    State/Province
    New York
    Posts
    134
    Post Thanks / Like
    Likes (Given)
    22
    Likes (Received)
    56

    Default

    I suggest you buy this book: https://www.amazon.com/gp/product/14...?ie=UTF8&psc=1

    I did when I re-worked my first vari-speed head and it was very helpful. A very important thing to check are the nylon/plastic bushings inside the two sets of variable speed pulleys. If these go bad you'll likely ruin your motor shaft and drive shaft. I've bought some from H&W. Also, check out their videos on repairing Bridgeport mills. YouTube

    Ted

  10. Likes HWElecRepair liked this post
  11. #8
    Join Date
    Jul 2019
    Country
    UNITED STATES
    State/Province
    Washington
    Posts
    43
    Post Thanks / Like
    Likes (Given)
    1
    Likes (Received)
    2

    Default

    Thanks to all who responded, I got the timing and drive belts replaced and the machine is up and running well. I deeply appreciate not only the comments but how quickly they came in; very timely and useful.

  12. Likes HWElecRepair liked this post

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •