Page 4 of 7 FirstFirst 1234567 LastLast
Results 46 to 60 of 96
  1. #46
    Join Date
    Jun 2020
    Location
    Freo
    Age
    68
    Posts
    141

    Default

    Quote Originally Posted by snapatap View Post
    congratulations, it will be good with a 10 hp motor, make sure you give us a review when you get it.
    i certainly will but at 1.6 ton it will take a while to even get it in the shed.
    Doing some mods to the engine crane as the original castors didn't want to roll with just half a ton on it. The rollers are for a manual pallet truck, supposed to be rated at 800kg each so 4 at the front should make the crane move a lot easier.
    IMG_20210120_182629.jpg

  2. #47
    Join Date
    Jun 2020
    Location
    Freo
    Age
    68
    Posts
    141

    Default

    Quote Originally Posted by simonl View Post
    Thats exciting. I'm excited for you. It will be a long wait I bet!

    Simon

    Sent from my SM-G970F using Tapatalk
    i suppose so but i have one now so not like i can't do things. 80 days puts it about end of March when the weather gets nice so the best time to play. I tend to hibernate when too hot or cold even though the shed has aircon so always nice in there. Yes very wimpy i know

  3. #48
    Join Date
    Sep 2010
    Location
    Lebrina
    Posts
    1,910

    Default

    Quote Originally Posted by oldbuggermike View Post
    Normal house supply is 63A in W.A.
    Plug it in and see what happens
    You'll need to be mindful of what you run in the house if you plan on utilising the full 10Hp potential. Air conditioning/heating and electric cookware will soon eat into the 30 odd Amps left after you feed the lathe, not to mention lighting and all the other electrical gadgets that modern living brings.
    On the plus side, the VFD will smooth things out a lot.

  4. #49
    Join Date
    Jun 2020
    Location
    Freo
    Age
    68
    Posts
    141

    Default

    Quote Originally Posted by Karl Robbers View Post
    You'll need to be mindful of what you run in the house if you plan on utilising the full 10Hp potential. Air conditioning/heating and electric cookware will soon eat into the 30 odd Amps left after you feed the lathe, not to mention lighting and all the other electrical gadgets that modern living brings.
    On the plus side, the VFD will smooth things out a lot.
    My current lathe is 2HP and its rare that i load that till it slows the motor, maybe done that 3 times in 10 years. I plan to try a breaker that is a lot smaller, 20A maybe, to see how often i trigger it but i do have a weird sense of humour.

  5. #50
    Join Date
    Feb 2003
    Location
    formerly from Sydney (north of The Harbour), NSW, Oz
    Age
    68
    Posts
    306

    Default

    Quote Originally Posted by oldbuggermike View Post
    Its driven by a Yasakawa VFD so soft start and not a lot of surge current. Underground power so getting 3 phase isn't likely. I have 10mm cable to the shed so that won't be a problem, not much of a run. Normal house supply is 63A in W.A.
    Plug it in and see what happens
    Quote Originally Posted by oldbuggermike View Post
    My current lathe is 2HP and its rare that i load that till it slows the motor, maybe done that 3 times in 10 years. I plan to try a breaker that is a lot smaller, 20A maybe, to see how often i trigger it but i do have a weird sense of humour.
    I really think you should involve a sparky before you get too far along this path of yours.
    As far as I know, a 10 HP motor (which draws over 30 amps) requires it's own dedicated circuit hard wired back to the main switch box. If your shed has its own sub-panel, the requirement might be hard wiring back to the sub-panel.
    Again AFAIK, the incorporation of a VFD doesn't negate the requirement for hard wiring the dedicated circuit.

    a "suck it and see" approach doesn't really cut it when it comes to electrical requirements and safety. For example, do you know by how much the current capacity of your 10mm cable is de-rated because it's buried?
    regards from Canmore

    ian

  6. #51
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    2,129

    Default

    Ian, under an "extremely" heavy cut that lathe will use less than 5 hp, so less than 15 amps. That 10 hp motor will never push a load that requires the full power of the motor, a 2.5 sec start up time on the vfd dampens any significant start up current even with a large chuck with a large job in it.
    Then if mike wants he can set the max amps in the VFD to maybe 20 amps, he would still have close to 7 hp and would never miss the other 3......

  7. #52
    Join Date
    Aug 2008
    Location
    Melbourne
    Age
    34
    Posts
    1,075

    Default

    Just for fun I got the FSWizard app out... 4mm depth, 0.2mm feed in 4140 comes to 6.5HP estimated power draw.

  8. #53
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    2,129

    Default

    Quote Originally Posted by elanjacobs View Post
    Just for fun I got the FSWizard app out... 4mm depth, 0.2mm feed in 4140 comes to 6.5HP estimated power draw.
    At what diameter elan ?

    and rpm
    Last edited by shedhappens; 21st Jan 2021 at 08:12 PM. Reason: more

  9. #54
    Join Date
    Aug 2008
    Location
    Melbourne
    Age
    34
    Posts
    1,075

    Default

    That was 75mm, but I just put in a few numbers from 30-150 and the difference is negligible (less than 0.2HP) as long as you adjust the spindle speed to suit.

    Surface speed 148 m/min, so 630 rpm @ 75mm

    Based on a carbide insert with TiAlN coating. Plain TiN coating is about 2/3 that speed and 2/3 power required.
    Last edited by elanjacobs; 21st Jan 2021 at 08:18 PM. Reason: more info

  10. #55
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    2,129

    Default

    elan I am pretty sure that I have done heavier cuts than that on my old macson many times, it is 5 hp and does not seem to blink at it. I have a 7.5 hp lathe also and it loves heavy cuts.
    Next time I have someone in the shed with me i will dig out the clamp meter and have a bit of a test.

  11. #56
    Join Date
    Aug 2008
    Location
    Melbourne
    Age
    34
    Posts
    1,075

    Default

    I don't know how the app does its calculations, I assume it's just working off shear strength of the material, not accounting for tool geometry and probably a bunch of other things. I mainly use it for surface speed as the work I do is mostly second op stuff chasing surface finish (usually Ra 1.6, sometimes Ra 0.8 um), rather than maximum material removal, so I can't really say how accurate it is for loading.

    Be interesting to see how reality compares

  12. #57
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    2,129

    Default

    Quote Originally Posted by elanjacobs View Post
    Be interesting to see how reality compares
    Most of the machines in my dads factory had amp meters on them so you would know how hard you could push them.

  13. #58
    Join Date
    Jun 2020
    Location
    Freo
    Age
    68
    Posts
    141

    Default

    Quote Originally Posted by shedhappens View Post
    Ian, under an "extremely" heavy cut that lathe will use less than 5 hp, so less than 15 amps. That 10 hp motor will never push a load that requires the full power of the motor, a 2.5 sec start up time on the vfd dampens any significant start up current even with a large chuck with a large job in it.
    Then if mike wants he can set the max amps in the VFD to maybe 20 amps, he would still have close to 7 hp and would never miss the other 3......
    Your thinking is very close to mine hence the flippant comment about the 20A breaker. I have installed quite a few VFDs but never played with a yasakawa so will not comment a lot till it comes and i can see what it can do. I will most likely limit current to some extent but won't set concrete numbers just now.

    I am or rather was an electronics tech for many years playing with all sorts of industrial and specialised computer gear and i also have an electrical license so i do know my way around this stuff even if i don't appear to

  14. #59
    Join Date
    Feb 2003
    Location
    formerly from Sydney (north of The Harbour), NSW, Oz
    Age
    68
    Posts
    306

    Default

    Quote Originally Posted by oldbuggermike View Post
    I am or rather was an electronics tech for many years playing with all sorts of industrial and specialised computer gear and I also have an electrical license so i do know my way around this stuff even if i don't appear to
    regards from Canmore

    ian

  15. #60
    Join Date
    Mar 2014
    Location
    South of Adelaide
    Posts
    1,225

    Default

    Quote Originally Posted by elanjacobs View Post
    Just for fun I got the FSWizard app out... 4mm depth, 0.2mm feed in 4140 comes to 6.5HP estimated power draw.
    That HP would be at the tool, with the gear reduction of the headstock, the HP required from the motor would be less, i have taken cuts like that on our 5HP lathe and it hasn't stalled (but i did shear the drive key for the feed on our old lathe). At least the hobby blokes can back the speed off a bit, they aren't under pressure to get stuff done like us pro's.

Page 4 of 7 FirstFirst 1234567 LastLast

Similar Threads

  1. Importing used toolroom lathes?
    By DoctorWu in forum METALWORK GENERAL
    Replies: 43
    Last Post: 13th May 2011, 11:03 AM
  2. Granite references: importing or not
    By Bryan in forum METALWORK GENERAL
    Replies: 39
    Last Post: 7th May 2011, 09:57 PM
  3. More about importing from China
    By neksmerj in forum METALWORK GENERAL
    Replies: 16
    Last Post: 3rd Nov 2010, 08:59 AM
  4. Importing U.S. Mig?
    By martrix in forum WELDING
    Replies: 30
    Last Post: 23rd Feb 2009, 11:09 PM

Posting Permissions

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