Thanks Thanks:  0
Likes Likes:  0
Needs Pictures Needs Pictures:  0
Page 2 of 2 FirstFirst 12
Results 16 to 26 of 26
  1. #16
    Join Date
    Jan 2006
    Location
    Blue Mountains NSW Australia
    Posts
    408

    Default

    I love those saws. Good on you for fixing it up.

  2. #17
    Join Date
    Nov 2006
    Location
    Heidelberg, Victoria
    Age
    79
    Posts
    2,074

    Default

    Hi Matrix,

    I'm curious about JB weld, as mentioned in your thread.

    I have a couple of dings on machined surfaces of my Hercus lathe.

    Will JB weld, take on the appearance of shiny metal when machined and/or polished?

    Does it dry clear when fully cured?

    Regards,

    Ken

  3. #18
    Join Date
    Feb 2005
    Location
    Melbourne, Australia
    Age
    46
    Posts
    83

    Default

    Quote Originally Posted by neksmerj View Post
    Hi Matrix,

    I'm curious about JB weld, as mentioned in your thread.

    I have a couple of dings on machined surfaces of my Hercus lathe.

    Will JB weld, take on the appearance of shiny metal when machined and/or polished?

    Does it dry clear when fully cured?

    Regards,

    Ken
    Hi Ken, it doesn't really look like metal when sanded, but polishing it may give a different effect. I do believe from their website that they are working on a clear epoxy.

    Here is a pic of it sanded with 120grit.

    I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.
    Albert Einstein

  4. #19
    Join Date
    Mar 2005
    Location
    Jindabyne
    Age
    74
    Posts
    40

    Default Jb Weld

    Hi Matrix,

    I too have a qustion for JB Weld I notice it is surrounding a screw hole is it really strong enough to take the tension.

    I have no idea just asking so I can file it6 in the memory bank.

    Cheers
    Brian
    Creator of Fine Firewood

  5. #20
    Join Date
    Feb 2005
    Location
    Melbourne, Australia
    Age
    46
    Posts
    83

    Default

    Quote Originally Posted by Outsider View Post
    Hi Matrix,

    I too have a qustion for JB Weld I notice it is surrounding a screw hole is it really strong enough to take the tension.

    I have no idea just asking so I can file it6 in the memory bank.

    Cheers
    If you look at that pic of that cracked thread before I filled it, you can see that there is more than 50% of the thread diameter left so, as it was you could still screw in the grub screw. I drilled a bunch of holes to help anchor the epoxy to the metal. As its only a grub screw with not a whole lot of pressure I think is should hold. Its not critical either so I figured I don't have much to lose if it fails. Sure was easier and quicker than messing around with brazing or welding.

    I know plenty of people on another forum who constantly use it to repair problems on chainsaws which have a lot of vibrations.

    Here are some stats from the website. and just for ther record, Kmart do stock JB Weld.


    Properties (psi)

    Tensile Strength: 3960 Adhesion: 1800 Flex Strength: 7320 Tensile Lap Shear: 1040 Shrinkage: 0.0% Resistant to: 500° F Mechanics -- you can use J-B WELD with confidence. It is designed for safe, reliable, permanent repairs in engine compartments and heated environments up to 500° F. It's strong as steel and impervious to water, gasoline, chemicals, and acids. Working with J-B WELD is quick, easy, and convenient -- and saves you time, work, and money!
    Not recommended for use on manifolds, exhaust systems, and other engine components which normally operate at temperatures above 500° F.
    I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.
    Albert Einstein

  6. #21
    Join Date
    Nov 2012
    Location
    Blue Mtns
    Posts
    115

    Default

    Waking this up from ages ago.

    i have the MEC 90 version of this saw. Seems okay but there is 1.5-2mm end float in the blade and was wondering what’s normal for a cold saw ? It seems to center nicely into the worm drive and there is no wheel backlash

  7. #22
    Join Date
    Oct 2007
    Location
    Alexandra Vic
    Age
    69
    Posts
    654

    Default

    I have experience with running the Brobo and chinese cold cut saws for some years and there was no play in the spindle of either unit. I would think that end play would make repeatable accurate cuts almost impossible and suspect that there are bearing issues in the final stage of the gearbox. The units I mentioned above usually use two worm reduction to get from the normal motor speed to blade speed. I knew of other factories using OMES units, and saw them in situ, but haven't handled them or worked with or on them, so I cannot comment on their engineering.
    I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.

  8. #23
    Join Date
    Nov 2012
    Location
    Blue Mtns
    Posts
    115

    Default

    Thanks. There’s an adjusting bolt on the end but am reluctant to take up the play from one end or another because it will mean it rides up one side or the other on the worm. There is no backlash on the worm drive .
    Attached Images Attached Images

  9. #24
    Join Date
    Nov 2012
    Location
    Blue Mtns
    Posts
    115

    Default

    Had an Italian friend look up OEMS and unfortunately they were taken over then the parent company went out of business . So not much chance of getting any further info

  10. #25
    Join Date
    Oct 2007
    Location
    Alexandra Vic
    Age
    69
    Posts
    654

    Default

    Looking at the pic you posted, I am wondering if the worm wheel is pinned to the spindle to lock it in position, or whether it floats on the spindle and has a sliding key for positive drive. The wear on the worm wheel suggests that it is running to the left of centre, relative to the work itself. I also note the collar on the right has been drilled, but cannot distinguish whether this is for a pin or a set screw. Further to the right still is a bushing which gives the appearance of being buckled or rotationally deformed in the portion between the casting and the collar.

    As a start to trying to understand the system, I would move the spindle end to end while viewing the worm wheel through the opening that the pic was taken through. That should tell you whether the worm wheel is locked to the spindle or free to slide on it. If free to slide, you may be able to minimise end play by adjusting the collars either side of the worm wheel without affecting where the worm and worm wheel run.

    I am aware of the innards of the chinese saw I mentioned previously, and the spindle in that is supported by taper roller bearings, which provide long term end float control for the spindle provided that they are kept properly lubricated. I am most surprised by the clearances between the collars and the casting or bushing in your pic, and wonder whether someone has been at it previously.
    I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.

  11. #26
    Join Date
    Nov 2012
    Location
    Blue Mtns
    Posts
    115

    Default

    Thanks Malb

    i think the wear you See is just lighting for the shot, it’s actually a still from a video I took but couldn’t post. . There is absolutely no play between the worm and pinion gear . Yes there is a hole to the right and a lock pin in there part protruding out the other side. When it runs it floats to the middle. But the worm does not float on the shaft. I think you could correct about somebody being in there before!

Page 2 of 2 FirstFirst 12

Similar Threads

  1. Laser Profile Cutting Metal
    By lasersolutions in forum METALWORK GENERAL
    Replies: 17
    Last Post: 8th Nov 2006, 04:31 AM
  2. Cutting Metal on a Wood saw
    By smidsy in forum METALWORK GENERAL
    Replies: 11
    Last Post: 26th Jun 2006, 01:40 PM

Tags for this Thread

Posting Permissions

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