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Type: Posts; User: rumpfy

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  1. Replies
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    My dad joined the RAAF as a wartime thing. He was...

    My dad joined the RAAF as a wartime thing. He was involved with three parts of the engine;

    The crankshaft.
    Among the local contenders to supply crankshafts, dad told me once that one of the...
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    Welcome to the forum jools. Interesting profile...

    Welcome to the forum jools.
    Interesting profile youi have there.
    I am in Bacchus Marsh now, lived in Parwan since 1987.
    I used to get small nuts and bolts and small diameter copper tubing from...
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    That was Wiltshire Files in Sunshine road. Olex...

    That was Wiltshire Files in Sunshine road.
    Olex was next door. The tower at Olex was used to produce 330 Kv crosslinked polyethylene underground Power cable. Nothing there anymore. Factory is...
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    Hi Baron, I loved this posting because of your...

    Hi Baron,
    I loved this posting because of your references to 'mm' , 'thou', '2BA', .
    Us colonials can be quite adept at manipulating units, but your reference to BA threads; well I have to ask....
  5. Replies
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    Yes, quite right, sorry for the error. The...

    Yes, quite right, sorry for the error.


    The quest for the answer as to the settings for cutting metric threads continues.
    This lathe has a 117 tooth gear.
    I accept what J&H says about publicity...
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    Ray suggests the oilers are 1/8 bsp. This size is...

    Ray suggests the oilers are 1/8 bsp. This size is about 3/8 inch diameter I think. I rather think you should precisely determine the actual thread.
    The Sheraton is based on the Southbend and I am...
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    Earlier today I prepared some stuff. I note J&H...

    Earlier today I prepared some stuff.
    I note J&H uses the word 'ring in' which is the word I used, so may be great minds think alike.

    Going back to post 8, the gear set up is shown to be...
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    My gut feeling is that the bores are not...

    My gut feeling is that the bores are not precisely aligned. It should be possible to fit each end of the shaft into each bearing to show that the shaft is a clearance fit. My feeling is that the...
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    [QUOTE=Mk1_Oz;1975640]Baahaa Just starting my...

    [QUOTE=Mk1_Oz;1975640]Baahaa

    Just starting my ratio calcs to see if I get what you did......work keeps getting in the way (but happy I still have a job).


    Every time I look in here the 3 or 4...
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    The gear set on shaft A has 3 sets of compound...

    The gear set on shaft A has 3 sets of compound gears to do the pitch multiplication.
    The pitch setting is selected by the lower row of 4 compound gears PLUS the extra gear on that shaft.
    Somehow...
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    [QUOTE= Lathes UK says there is 68 metric...

    [QUOTE=

    Lathes UK says there is 68 metric threads from 0.5 to 11.2 mm

    The thread chart shows some gaps for the spring gears at positions 3, 6, and 9.
    The pitches for the two right hand columns...
  12. Replies
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    According to Lathes UK, this lathe can do 80...

    According to Lathes UK, this lathe can do 80 Imperial pitches. Given the 10 gear cluster and the 4 A,B,C,D there is a range of 80 pitches.
    My best guess of the 10 gear cluster is:
    posiion/teeth...
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    Hi Mk1 This stuff fascinates me. Looking at the...

    Hi Mk1
    This stuff fascinates me.
    Looking at the pictures from the UK, it looks to me that the cog (stud gear?) that drives the change gears is not on the same centre line with the spindle. It must...
  14. Thread: Premo Apron.

    by rumpfy
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    3,240

    Thanks guys for your suggestions. I looked at...

    Thanks guys for your suggestions.

    I looked at the effect of the radius and it seems that when the shaft goes into the hole by more than about 0.003", the shaft diameter at that point is about...
  15. Thread: Premo Apron.

    by rumpfy
    Replies
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    3,240

    Premo Apron.

    This post is related to my earlier post; 'Broken shaft'

    I have a Premo apron which has been damaged.
    The Broken shaft posting has had replies that helped my thinking in what to do. I think I...
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    The cheapest piece of bronze I could find for it...

    The cheapest piece of bronze I could find for it was $50+ so yesterday arvo I found some C.I. and turned up a suitable piece.
    I have left it oversized for tapping so it will be safe to clamp it...
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    The nut I got was like the nut in post#16. It...

    The nut I got was like the nut in post#16. It needs to be machined.
    In your case you have a body and an insert.
    The PREMO has an integrated threaded body; a bit like yours but only one piece.
    ...
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    FWIW, My PREMO has 1/2" by 8tpi ACME threads on...

    FWIW,
    My PREMO has 1/2" by 8tpi ACME threads on all the screws/nuts.
    I have looked at what to do to renew the screw/nut.
    I was able to measure the wear on both the screw and the nut and found that...
  19. Thread: 4 jaw dismantle

    by rumpfy
    Replies
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    6,320

    FWIW. In the last 12 months I have had 2 CROWN 4...

    FWIW.
    In the last 12 months I have had 2 CROWN 4 jaw Chucks to revamp.
    One came apart quite easily. Just a light tap with a punch at the side of the screw got the plugs moving. Was able to clean...
  20. Thread: Broken shaft

    by rumpfy
    Replies
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    2,803

    Thanks Jekyl & cask, The shaft is uniformly hard...

    Thanks Jekyl & cask,
    The shaft is uniformly hard all the way through.
    I think the best is to make a new shaft. I am not sure if silver solder, or even brazing, will be strong enough to take the...
  21. Thread: Broken shaft

    by rumpfy
    Replies
    6
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    2,803

    Broken shaft

    I am rejuvenating a PREMO lathe, ser no 61115. In its life there was a collision with the power feed driving the saddle/carriage. The crash has fractured a bushing/boss hole in the apron casting. A...
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    You dont say what lathe you have. I am working...

    You dont say what lathe you have.
    I am working on a PREMO lathe ATM.I am writing up the job.
    Here is that part which relates to the headstock. There are pics but not sure how to load them
    ...
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    To cut 26tpi use the setting for 32 tpi but with...

    To cut 26tpi
    use the setting for 32 tpi but with the 4 change gears 20:40:20:80 use 20:52:32:80.
    Should work.
    I made a 21 tooth gear for my Myford to cut metric threads. Made up a blank, and cut...
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    My MK2 5.5 inch premo has a 1 3/4 inch shaft....

    My MK2 5.5 inch premo has a 1 3/4 inch shaft. Getting the chuck off was difficult, but I engaged the back gears and applied steady pressure to the chuck with a long bar and it came off. BUT it was...
  25. Thread: Premo Lathe

    by rumpfy
    Replies
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    I have recently got a Premo MK 2 I believe. It...

    I have recently got a Premo MK 2 I believe. It has the quick change gearbox.
    I am currently rebuilding the lathe.
    I dont have any photos ATM, but in time I will be able to help you.
    paul
  26. Thread: Premo Lathe

    by rumpfy
    Replies
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    16,631

    I have a premo mk 2 I believe, which is going...

    I have a premo mk 2 I believe, which is going through a big strip down and clean up.
    I may be able to help you.
    paul
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