Free 186 More Best Homemade Tools eBook:  
Get 2,000+ tool plans, full site access, and more.

User Tag List

Results 1 to 7 of 7

Thread: Need help - press drill spring

  1. #1
    Supporting Member rendoman's Avatar
    Join Date
    Nov 2015
    Location
    Italy
    Posts
    435
    Thanks
    451
    Thanked 496 Times in 241 Posts

    rendoman's Tools

    Need help - press drill spring

    Hi all!

    I'm searching for good advice about how to install the coil spring in my press drill.
    I bought this spring, the internal diameter is 22mm, perfect size for the shaft. The trouble is the external diameter, the round seat for pin prevents the spring from going into place.
    The spring has enough force, it's quite hard to turn by hand, it's even difficult to use the left threaded alu case.

    I'm thinking to build a sort of frame jig in order to compress the spring and then tie again with wire, but maybe there is a better way

    Any advice welcome, thank you for your suggestions

    Need help - press drill spring-dsc04195_1600x1200.jpg Need help - press drill spring-dsc04196_1600x1200.jpg

    186 More Best Homemade Tools eBook

  2. The Following 2 Users Say Thank You to rendoman For This Useful Post:

    PJs (May 31, 2018), Seedtick (May 29, 2018)

  3. #2
    Supporting Member olderdan's Avatar
    Join Date
    Jun 2016
    Posts
    781
    Thanks
    1,456
    Thanked 1,531 Times in 463 Posts

    olderdan's Tools
    From your picture it would appear that the spring has to many coils than is necessary and you would have to wind it up a lot to reduce the diameter enough, making it difficult to assemble. I think I would try halving the amount of coils and re forming the end loop curling outwards.

    2000 Tool Plans

  4. The Following 6 Users Say Thank You to olderdan For This Useful Post:

    Jon (May 29, 2018), Paul Jones (May 30, 2018), PJs (May 31, 2018), rendoman (May 29, 2018), thehomeengineer (May 30, 2018), Toolmaker51 (May 30, 2018)

  5. #3
    Supporting Member thehomeengineer's Avatar
    Join Date
    Nov 2017
    Location
    Berkshire UK
    Posts
    705
    Thanks
    720
    Thanked 2,062 Times in 406 Posts

    thehomeengineer's Tools
    Hi
    When I have fitted return springs in the past they have been supplied with a c-shape 3/16"-1/4” diameter ring which is slightly smaller diameter than the housing so it can be slid in place (safely) and once in place the ring can be discarded. I have not seen this type with a wire is wound to hold the coiled spring.
    Be very careful as there is a lot of stored energy and when they go can take you by surprise. You could roll a ring and re wind the spring to fit the new ring, again be very careful if you chose to rewind the spring. Also make sure the spring is fitted the correct away around. So annoying when it is fitted and you realise it is in the wrong way and you have to remove it and rewind. Hope this helps.

    Name:  images.jpg
Views: 653
Size:  9.4 KB

    The Home Engineer
    Last edited by thehomeengineer; May 29, 2018 at 02:42 PM. Reason: ADDED PHOTO

  6. The Following 7 Users Say Thank You to thehomeengineer For This Useful Post:

    Andyt (May 30, 2018), Frank S (May 29, 2018), Jon (May 29, 2018), olderdan (May 30, 2018), Paul Jones (May 30, 2018), rendoman (May 29, 2018), Toolmaker51 (May 30, 2018)

  7. #4
    Supporting Member rendoman's Avatar
    Join Date
    Nov 2015
    Location
    Italy
    Posts
    435
    Thanks
    451
    Thanked 496 Times in 241 Posts

    rendoman's Tools
    Thank you all for the advices!

    It's nice this C shape ring,it seems better than the wire!

    I just fixed the spring! As olderan said, I had to cut the spring and re forming the stop loop with oxy torch. I cut more or less 60cm, in order to put the spring inside the bobbin. With surprise I noticed that the energy stored was high (when I cut the wire), but to be honest it was perfectly manageable with leather gloves. I added a little pre-loading of 2 turns. The spindle axis returns fluid, the descent is light. I hope this spring will last !

    Need help - press drill spring-dsc04200_1600x1200.jpg Need help - press drill spring-dsc04205_1600x1200.jpg

  8. The Following 6 Users Say Thank You to rendoman For This Useful Post:

    Andyt (May 30, 2018), olderdan (May 30, 2018), Paul Jones (May 30, 2018), PJs (May 31, 2018), thehomeengineer (May 30, 2018), Toolmaker51 (May 30, 2018)

  9. #5
    Supporting Member
    Join Date
    Dec 2016
    Posts
    332
    Thanks
    3
    Thanked 122 Times in 98 Posts
    My suggestion would be to throw the entire spring assembly away and purchase a gas spring cylinder. I used two of these on a hydraulic press that I built. they are the the "pull" type( they have specific pull forces when retracting). You can select one that will fit your needs for both stroke length and force. I bought mine from Mcmaster Carr in Chicago, Ill.
    I have not seen this done on a drill press, so be the first guy! I like the ones I put on my hydraulic press, and they solved a lot of space problems and eliminated two bulky return springs that were any ones guess as how much force they had.
    Hope my reply was useful.

  10. The Following 2 Users Say Thank You to owen moore For This Useful Post:

    rendoman (May 30, 2018), Toolmaker51 (May 30, 2018)

  11. #6
    Supporting Member Beserkleyboy's Avatar
    Join Date
    Aug 2014
    Location
    Sunny South Coast NSW, Australia
    Posts
    366
    Thanks
    473
    Thanked 226 Times in 132 Posts

    Beserkleyboy's Tools
    I can't second the safety issue enough. As the homeengineeer said, heaps of stored energy, enough to require 4 stitches in the fleshy part below the thumb! I still curse that spring when I look at it (nearly every day)...Glad all worked out in the end. Cheers

    Jim in the sunny South Coast NSW, Australia

  12. The Following 7 Users Say Thank You to Beserkleyboy For This Useful Post:

    Andyt (May 30, 2018), olderdan (May 30, 2018), Paul Jones (May 30, 2018), PJs (May 31, 2018), rendoman (May 30, 2018), thehomeengineer (May 30, 2018), Toolmaker51 (May 30, 2018)

  13. #7
    Supporting Member Toolmaker51's Avatar
    Join Date
    Feb 2016
    Location
    Midwest USA
    Posts
    5,330
    Thanks
    7,041
    Thanked 2,977 Times in 1,892 Posts

    Toolmaker51's Tools
    I'm in full agreement with ALL of the details mentioned, especially that it looked far too long. 2 turns are a good preload setting. I frequently alter setting in accord with depth and certain operations, including occasional oiling of the spring. Really smoothes out binding on deeper work.



    186 More Best Homemade Tools eBook
    Sincerely,
    Toolmaker51
    ...we'll learn more by wandering than searching...

  14. The Following 4 Users Say Thank You to Toolmaker51 For This Useful Post:

    olderdan (May 30, 2018), PJs (May 31, 2018), rendoman (May 30, 2018), thehomeengineer (May 30, 2018)

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

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
  •