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  1. #1
    Join Date
    Jun 2020
    Location
    Australia
    Posts
    6

    Default Restoring my ARM

    My inaugural post (more or less on the commencement of my restoration effort)!

    Folk may have seen on other posts that I have acquired a Hurcus ARM model - serial # 15668.

    So the first thing I did was buy the renovation book from AMH - and what a nice book it is! While I was at it, I bought the lubricating felts - I know I be needing them!

    I've been looking at a list of things I will need to get the thing up and running, as well as things I want to get... In doing so, I wanted to seek the collective wisdom of people here:

    First up, the lathe has the plain bearing version of the counter-shaft. I suspect unsurprisingly, these bearings are somewhat worn. Is it "usual" practice to swap these out for roller bearings (acknowledging that the counter-shaft pivot/yoke would need to be replaced: mine probably does anyway as at some point it has been broken and welded). What are the pros and cons here?

    Second, the diagrams show a guard plate sandwtched between the gears and the gearbox. The Southbend part is PT389NK3, AMH lists it simply as "369", but goes on to describe it as for B and C models. So is this guard for A models also? Or is it different part? Or did the Hercus A model in fact never have this guard?

    Lastly on this round, as a generalisation (if such is possible) are screw threads on the lathe UNC, UNF? Or perhaps Whitworth or some other?

    Sorry I don't have any pictures to share - it's all pretty much in one piece still!

    Cheers now, and stay safe

    Geoff B

  2. #2
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    61
    Posts
    4,500

    Default

    Counter shaft up to you, but have never heard of it being a must do.
    Threads, UNS, BSPT,BSW,BSF.
    The guard plate is also fitted to the A it stops swarf and fingers getting caught in the change gears, if you didn't want to buy it you could probably make something suitable from a bit of sheet metal or similar ridged material.

  3. #3
    Join Date
    Jul 2008
    Location
    near Warragul, Victoria
    Posts
    3,401

    Default bearings

    Geoff

    Somebody did a detailed write up on the roller bearing conversion of the counter shaft . He restored a Hercus and did a blog on it . Do a search maybe
    Hercus 9" Lathe Countershaft Bearings
    Found it

  4. #4
    Join Date
    Jun 2020
    Location
    Australia
    Posts
    6

    Default

    Morrisman - thanks for the link, I will read with interest.

    Pipeclay, my thanks also. As I am already missing part of a finger courtesy a table saw, I'll be going for the guard!

    Subject to what I might read on the link kindly provided, I suspect I'll stay put with the "plain" counter shaft. I won't be a big time user, so should not put the bearings under strain for days and days at a time - so I suspect once fixed up, they'll probably outlive me! (The reason for my question was really to find out if these were a know weak point.)

    Cheers now

  5. #5
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    61
    Posts
    4,500

    Default

    Generally only a weak point if not lubed.
    I would suggest that unless you are going to be using the lathe almost continuously for the day to just lube all the oil points once a day, if using continuous twice a day.
    For the back gear only when it's to be used.
    If you a fussy about oil leaking after lubing wipe it up after use or the next day.

  6. #6
    Join Date
    Aug 2015
    Location
    Adelaide
    Posts
    92

    Default

    I did the bearing upgrade on my ARM which ended up being a lot of work so as you said, easier to stick with the plain bearing type, but i had to machine up the bearing holders and the pivot which AMH had a blank unit then because I wanted to retain the factory look and set up so I put a bush in the pulley and a key way as well, I was lucky that I already had a setup to copy but I am glad that I did it in the end.
    Attached Images Attached Images

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