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  1. #1
    Join Date
    Mar 2011
    Location
    Taree NSW
    Posts
    38

    Default Macson surface grinder

    Picked up a Macson bench mounted surface grinder this weekend minus motor and faulty magnetic platen - can anyone one tell me what H.P. motor should be on it , I believe it is a 1440 but don't know what H.P - have searched the forum but can't find the address for Peter Tedesco who remagnetises these platens??
    I also got a valve refacing machine which I have no use for but think it could be converted to a tool & cutter grinder,
    has anyone any experience with this idea?

  2. #2
    Join Date
    Aug 2013
    Location
    Melbourne
    Posts
    148

    Default

    Hi Alf
    I have a Macson SG
    The motor fitted to it is 0.5 HP 2850 RPM
    Cheers
    Peter

  3. #3
    Join Date
    Mar 2004
    Location
    Carine WA
    Age
    68
    Posts
    75

    Default

    Quote Originally Posted by Alf Scotting View Post
    ...faulty magnetic platen -........ the address for Peter Tedesco who remagnetises these platens?
    Hi Alf

    This is the address I was provided to have my Eclipse brand repaired.

    There is a company below who has in the past been able to service and repair Eclipse Premier range chucks.
    We strongly recommend you contact them

    Magfield Manufacturing PTY Ltd
    5/4 Ovata Drive
    3043 Tullamarine
    Victoria
    Australia
    Tel 0061 (0) 3 9338 3655
    Fax 0061 (0) 9338 7222
    Contact Peter Tedesco

    Eclipse in the UK advised me (of course) that magnetic chucks cannot be "self repaired". Under threat of losing almost ALL magnetic holding power. To quote the response from Eclipse Magnetics UK, "dismantling the chuck without "demagnetisation" reduces the clamping force significantly, and is not recommended. After repair and assembly the chuck is "re-magnetised" to bring it back to full power.

    Being a little bit familiar with magnetics, from a good English education in physics in the early '60s, I didn't believe it! I could not see how the force could be reduced "significantly" by disassembly. So with this knowledge in hand, I decided to disassemble my chuck anyway (I also happened to have a second but MAIN mag chuck anyway) The short story is disassembly, clean, re-oil, seal all mating surfaces and reassembly produced no discernable difference in holding power!

    I did not use any calibrated measurement for my assessment of mag force, so my personal observation is quite subjective!

    With this success in mind, I chose to "bite the bullet" and repair the "MAIN" 400mm/18" mag chuck

    Keep in mind that both of these chucks were magnetically fully functional. The need for repair was the stiffness of the operating handle and the huge effort required to engage and disengage the magnets.

    The final result? Two very functional mag chucks the smaller of the two is the "normal" 300mm/12" size and the large chuck as noted above.

    Finally...

    If you attempt to do any dismantling of a magnetic chuck, be aware THEY ARE HARD TO DISASSEMBLE! The magnetic forces holding the components together are IMMENSE. Probably why the "professionals" demagnetise the unit first It does require the use of at least a VERY large crowbar pry-bar to get them apart - and this is to SLIDE them apart.

    On reassembly DO NOT PUT FINGERS BETWEEN COMPONENT PARTS - THERE IS A RISK OF SERIOUS INJURY!!!!!!!! I managed to create a scar at the base of my thumb, by manually trying (by hand) to push the top plate off the magnets. After pushing, pushing, pushing with great force, the plate finally slide away allowing my hand to smack into the (relatively) sharp edge of the body casting. I won't do that again PLEASE TAKE HEED!

    I used a pipe clamp (on the large mag chuck) attached to one end of the top plate in an attempt to rotate the top plate 90 - the galvanised pipe bent, the top didn't budge!

    As a very subjective test, using two 25mm square steel bars, I discovered that 10 square inches/64 sqcm could support 90+kg (me) placed approximately 12"/300mm from the end of the chuck!!!

    I have read/been told that keepers, bars that join the magnetic poles of magnets help maintain (and possibly improve) the magnetism. So I used metal plates across the poles during my mag chuck repairs.

    Eclipse in the UK no longer repair their OWN product!!!!!!!
    After repair and assembly the chuck is "re-magnetised" to bring it back to full power. These processes are now carried out if required by our factory in China. Sadly all the skill, equipment, and process documentation have been lost to us over time.
    ...another excerpt from Eclipse Magnetics UK
    In essence your efforts may come to nought as the chucks will not function correctly
    Well, they got that WRONG. They are unfamiliar with MY repair capabilities - especially when it come to items that "allegedly" can't be repaired!


    Apologies for the long reply, I hope at least the address is helpful
    Kind Regards

    Peter

  4. #4
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    5,443

    Default

    Given the price of chinese chucks unless you live in Melbourne, it is simply not worth it to rezap old chucks that do not work.
    Light red, the colour of choice for the discerning man.

  5. #5
    Join Date
    Mar 2011
    Location
    Taree NSW
    Posts
    38

    Default

    Hi Petip,
    Thanks for post - I only have a pulley on the spindle - could you please advise dia. on yours of the spindle and motor ? I have picked up a 3/4 Horse for my SG and wish to make sure I get speeds right
    Cheers Alf

  6. #6
    Join Date
    Aug 2013
    Location
    Melbourne
    Posts
    148

    Default

    Hi Alf
    Flat belt drive
    motor pulley 3.5"
    spindle pulley 2.8"
    Pete

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