• Welcome to the DeeperBlue.com Forums, the largest online community dedicated to Freediving, Scuba Diving and Spearfishing. To gain full access to the DeeperBlue.com Forums you must register for a free account. As a registered member you will be able to:

    • Join over 44,280+ fellow diving enthusiasts from around the world on this forum
    • Participate in and browse from over 516,210+ posts.
    • Communicate privately with other divers from around the world.
    • Post your own photos or view from 7,441+ user submitted images.
    • All this and much more...

    You can gain access to all this absolutely free when you register for an account, so sign up today!

best way to shorten pneumatic shaft?

Thread Status: Hello , There was no answer in this thread for more than 60 days.
It can take a long time to get an up-to-date response or contact with relevant users.

z06pilot

Member
Jul 9, 2014
11
0
11
42
I ordered a couple of shaftsfor my evo 70, and they are about 5" 12.4 cm longer than I need them to be. I have not loctited the cyrano shaft addapter on yet, what is the best way to shorten them? I could cut the rear off, but I believe that I would need to turn a section of the shaft on a lathe so that the 9/32 shaft could be threaded to 6mm. Or, I could cut the front off, but then would have to profile a new tip, drill and rivet the flopper back on. Also, if I cut the tip off, I would believe the new tip would not be as hard as the original, because the hardness is in the surface of the steel.
 
It really depends on the tools that you have access to. If you have to pay someone to do it then it may be easier to just buy shorter shafts to replace them. In terms of the precision required the screw thread on the tail is more demanding than drilling a new flopper hole and grinding a new tip as the screw thread has to be cut straight with respect to the shaft axis. Plus you have to reduce the diameter of the tail as you have noted.

As I have a lathe and thread cutting dies and a mounting stock or frame to hold them in then I would cut the spear tail off and re-thread it, but not everyone has such equipment, whereas a drill press, vee block (to hold the shaft stable for cross-drilling) and bench grinder (for grinding the new spear tip) are more likely to be available in home workshops.
 
Last edited:
  • Like
Reactions: Gazz
DeeperBlue.com - The Worlds Largest Community Dedicated To Freediving, Scuba Diving and Spearfishing

ABOUT US

ISSN 1469-865X | Copyright © 1996 - 2024 deeperblue.net limited.

DeeperBlue.com is the World's Largest Community dedicated to Freediving, Scuba Diving, Ocean Advocacy and Diving Travel.

We've been dedicated to bringing you the freshest news, features and discussions from around the underwater world since 1996.

ADVERT