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  1. Replies
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    A 3 MT has way more area than a short jacobs...

    A 3 MT has way more area than a short jacobs taper so fitted the way you do it I can understand how much more grip it would have .
    My chuck has only let go once when using a large drill and just...
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    +1 on that .

    +1 on that .
  3. Replies
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    That is correct about the collet chuck but an...

    That is correct about the collet chuck but an ER40 collet will hold better than many TS chucks will at the collet jaws . If they have the same tab at the end they hold the same as a MT drill will...
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    Dito mate , have an ER 32 and 40 collet chuck...

    Dito mate , have an ER 32 and 40 collet chuck with MT3 . If I think the drilling job is too hard for the Jacobs chuck or the drill don't fit , then I have the collet chuck option . Generally what...
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    It is just too slow and messy that way ....

    It is just too slow and messy that way . https://www.youtube.com/results?search_query=remove+rust+washing+soda&sm=12
    Feed the molasses to the cattle not the rust .
  6. Replies
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    For the hobbyist with a smaller lathe MT drills...

    For the hobbyist with a smaller lathe MT drills are not really that great . They are expensive and usually lack a range of sizes like you would get in a set of normal drills . Also if you break one...
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    So do I . just finished the inside of a motorcyle...

    So do I . just finished the inside of a motorcyle tank . Basic tools are 12 volt car battery , good size battery charger , washing soda .
    There is plenty of info on this method on youtube etc.
  8. Well then machine the NT30 and M12 thread...

    Well then machine the NT30 and M12 thread external part first . Then machine an Nt 30 internal taper in a blank held in a chuck . Use a piece of M12 continuous thread as a draw bar to hold it in the...
  9. I guess it depends on how much spindle bore...

    I guess it depends on how much spindle bore diameter you have . The way I could do it is , machine the NT30 and M12 thread first then remove it and place the No 5 MT to NT30 adaptor in my lathe and...
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    Ebay is a joke now and I avoid it if possible. ...

    Ebay is a joke now and I avoid it if possible. The postage rip offs by some sellers are outrageous .
    If I see something I am interested in I send an email asking postage costs and delivery...
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    Welcome back mate. I have been worried about you...

    Welcome back mate. I have been worried about you and your family . Was not sure wether I should turn up at the old place or what .
    Good to hear you are ok .
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    The one I have has a 12 volt battery charger...

    The one I have has a 12 volt battery charger built in , that's all I use it for , as an emergency battery charger. Anyway you don't need to rip it apart just buy a plug in 240 v battery charger and...
  13. lay it down and use a coarser blade . If you...

    lay it down and use a coarser blade . If you stand it up it could vibrate and chatter even with a fine blade until it gets down but by then it could have run off the cut. The less the bandsaw arm has...
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    I hope that was one of those precision angle...

    I hope that was one of those precision angle grinders :doh: We all know someone a bit like that . A 16 Hp motor is worth a lot of money fancy butchering the shaft with an angle grinder . Some people...
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    If the shaft is 1" exactly then a bore of...

    If the shaft is 1" exactly then a bore of 1.0005 should be a push fit . If it's a bit on the loose side then put it on with plenty of medium Loctite .
  16. I am going to say two stroke oil measures .

    I am going to say two stroke oil measures .
  17. Replies
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    My slut drill is bigger than 1/4" though . :D

    My slut drill is bigger than 1/4" though . :D
  18. It's not such an issue on a modern lathe with an...

    It's not such an issue on a modern lathe with an instant stop foot brake . I cut metric and Imperial on an Imperial lead screw and never use a thread dial on Imperial . I just hit the foot brake and...
  19. If you have the correct gear combination for the...

    If you have the correct gear combination for the pitch then it is possible to disengage the half nuts without using a thread dial . You have to close the half nuts and pull the lathe forward to start...
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    This is my solution to holding full length HSS....

    This is my solution to holding full length HSS. It allows the QC tool holder to still be used for other kinds of tooling .
    Allows the HSS to be removed and replaced quickly when re sharpening and...
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    I am getting that value also now because Ueee...

    I am getting that value also now because Ueee pointed out that my initial math structure was wrong . Now I'm fine and I have adjusted the spreadsheet math and it concurs with the calculator and my...
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    Thanks that helped a lot what I did was divide...

    Thanks that helped a lot what I did was divide the initial output by two and apply Arctan to that product and it gives the exact same values as yours and the other programs I have also. Also checked...
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    Ok I am not sure what you are saying it's to...

    Ok I am not sure what you are saying it's to unexplained. However it seems your calculation is different to mine.
    Mine is 1.5 - .5 = 1 / 12 = .08333r then I press 2nd & Tan-1 on my calculator =...
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    Does not seem to make much difference. Can you do...

    Does not seem to make much difference. Can you do me a favour and calculate this taper :- Small end .5" . Large end 1.5" length 12"

    Give the taper half angle to at least 4 decimal places and what...
  25. Replies
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    Yes I set my compound two ways , against the tail...

    Yes I set my compound two ways , against the tail stock quill or against a bar between centres . If you already have a job in the lathe and you need to change angles then I use the tail stock quill...
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    The principls are the same but it's a long way ...

    The principls are the same but it's a long way from the lathe centers to the Taper Attachment so it's going to be a different setup but same sine bar principle.
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    I will be making a round bar guide as I can't...

    I will be making a round bar guide as I can't machine a dovetail long enough
    in one setup .
    I thought of using a sine bar right against the guide bar but the centre height is well above the TA so...
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    Anybody ? 59 views and no one :?

    Anybody ? 59 views and no one :?
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    Sine bar setting taper attachment

    I need help with a concept . I want to build a taper attachment to fit an Al 1000c lathe .
    I don't want to set it with graduations of any kind as I just can't see them well enough and they are just...
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    No Dave I would not know how to do that mod . I...

    No Dave I would not know how to do that mod . I am sure better bearings would help heaps . That is one of the reasons I run a bit slower to help control the coolant but if I put up coolant barriers...
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    Something like that , maybe transport grease...

    Something like that , maybe transport grease that had dried to hard film in the small end .
  32. Replies
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    I produce blue chips also but not as much as...

    I produce blue chips also but not as much as that. I feel you are just hardening up the steel as you cut . Carbide inserts will do it but the extra heat will reduce their life .
    For the hobbiest...
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    I agree 1300 is too fast for most hobby...

    I agree 1300 is too fast for most hobby situations . I have run mine upto 700 rpm on K245 steel but it gets too hot without coolant . Now I just use 250 to 400 depending on the steel . If I use flood...
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    It does not matter it still works for indexable...

    It does not matter it still works for indexable inserts even though you can speed it up in some cases . However for general hobby workwithout flood coolant it works ok for me and 200 to 250 RPM on a...
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    2 mm is too much cut for a HM 40 . It lacks...

    2 mm is too much cut for a HM 40 . It lacks rigidity and HP . Also the spindle speeds being touted in this thread are too high for steel .
    For soft steel at 100 SFPM a 50mm x 6 tooth face mill...
  36. Replies
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    I think the tool angle looks wrong . It is hard...

    I think the tool angle looks wrong . It is hard to tell from the funny angle of the photo though. Seems to me to be angled toward the centre of the spindle. It would be better for facing to have it...
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    You can use "Dylon " clothing die.

    You can use "Dylon " clothing die.
  38. It is interesting to see different views....

    It is interesting to see different views. However I tend to focus on that tactical part as that is what I know best . I am not qualified to be thinking to much , finance or Industrial policy and...
  39. China is sucking the life blood right out of us...

    China is sucking the life blood right out of us like a giant leach on our back. At one end it is keeping us afloat buying our minerals that won't last forever . At the other end it closes down our...
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    The only thing I can add is one time I had a...

    The only thing I can add is one time I had a cheap MT3 chuck that would constantly come loose after backing off . In the end I tracked it down to the small end being too big and it never locked up...
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    I have had stuff come from America quicker than...

    I have had stuff come from America quicker than from Sydney 2 hours away . Our postage system is very patchy to say the least. We had three parcels posted last week from Sydney all posted together...
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    2.83 deg. is right but I can't show you any math...

    2.83 deg. is right but I can't show you any math as I use a spread sheet calculator.
    It has been right so far but it may well be wrong for 127 holes as I have never tried that yet .
  43. Replies
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    Were you climb milling or conventional milling ?...

    Were you climb milling or conventional milling ? Saws don't like to be climb milled as far as my limited experience indicates .
  44. Replies
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    With a 40 -1 head if the dividing plate has a 17...

    With a 40 -1 head if the dividing plate has a 17 hole ring then advancing every 4 holes on the 17 ring will divide a circle by 127 .
  45. Replies
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    Nice setup , it should yield accurate results as...

    Nice setup , it should yield accurate results as long as the base plate angle is in line with the lathe centre . I also use this principle to turn tapers . On my lathe it is easier to just bolt the...
  46. After re-reading it you are right Dave . I...

    After re-reading it you are right Dave . I thought he wanted to also market the idea , silly me .
  47. The average guy has a real problem nowadays with...

    The average guy has a real problem nowadays with marketing any new invention.
    You can present it to a prospective buyer or manufacturer only to have them say no , and then six months later your...
  48. Replies
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    No worries mate . It sure helps to have some...

    No worries mate . It sure helps to have some pictures and info on the original lathe models before you start restoring . Sometimes the owners make modifications or add new parts that may make model...
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    It is definitely a Portass lathe , made in...

    It is definitely a Portass lathe , made in Sheffield England. Possibly a slight modification of an S , X or XL model , it is hard to say , then sold under another name .
  50. Replies
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    I agree a poly Crystalline Diamond insert would...

    I agree a poly Crystalline Diamond insert would be good for turning . They are good for plastics and other non ferrous stuff .
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