Harrison M250 Restoration

  1. R-D-R Forum Supporter

    Messages:
    1,137
    Location:
    Derbyshire - England
    Thanks @mylesdw thats really useful. Interestingly the two big tool holders it came with had large discs with bearings that looked like they should fit in a recess but they are too large for the lathe. When I first looked at this I assumed it would be an arrangement like yours but when I got hold off the parts diagrams it doesn't indicate a washer, the tool holder fits straight on (or at least thats what it looks like). I need to do something, not sure whats easier - create a recess like yours in the holder and a thick washer or as I planned take some off the bottom so the tool holder fits into the recess. something to ponder hmmmm

    When I get back home next week this is next on my mechanical list to address. Need to get the VFD boxed up as well.
     
  2. R-D-R Forum Supporter

    Messages:
    1,137
    Location:
    Derbyshire - England
    Back home for a few days and decided to sort the tool post so made a post holder for the old toolpost so I can use it to cut the new toolpost:

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    Mounted the toolpost and got it as true as I could, I still struggle using the indicators but getting quicker.

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    Cutting went ok, it was noisy on the edges! got it done in half a dozen light passes

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    Fit’s nice and snug, just need to tidy up the edges but another job off the list :-)

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  3. Brad93

    Brad93 M J B Engineering

    Messages:
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    Essex
    Is that generic Chinese toolpost?
     
  4. R-D-R Forum Supporter

    Messages:
    1,137
    Location:
    Derbyshire - England
    Yep a Chinese cheapo one, I got the toolpost from arc euro and the holders from banggood.

    It’s the 250-200 size, holders are 250-201 for standard through -207 for parting, boring etc.

    Seams sturdy enough for me so far.
     
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  5. armalites Member

    Messages:
    5,223
    Herefordshire
    Fair play, you've come long from starting with an incomplete lathe
     
  6. Carl Wilson Member

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    1,742
    Location:
    Moray
    Great work. Nice die holder in your tailstock. Home made?

    It's brilliant to see how far your project has come.
     
  7. R-D-R Forum Supporter

    Messages:
    1,137
    Location:
    Derbyshire - England
    Thanks guys, I'm starting to enjoy using it rather than restoring it which is nice :-) loads to learn but all these tiny jobs are teaching me something every time. Need to crack on with the VFD enclosure next and get all the wiring made good.

    re the die holder its been given to me by a friend. Its a small one for 1inch die I will be making some adapters and maybe a better handle. I decided to use it for the M10 thread
    just to have a go and I made use of the jog doing it too :-). I cut the m16 thread using the lathe.
     
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  8. R-D-R Forum Supporter

    Messages:
    1,137
    Location:
    Derbyshire - England
    Had to use my sheet bender to do a favour for a friend tonight and got side tracked afterwards making some organisation accessories for the lathe. Ill spray them to match when I paint the VFD enclosure.

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    Should stop me piling things up on tray base was getting very messy.
     
  9. Carl Wilson Member

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    1,742
    Location:
    Moray
    Very good. Think I might be copying those ideas!
     
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  10. R-D-R Forum Supporter

    Messages:
    1,137
    Location:
    Derbyshire - England
    Not had much time lately, made a start of the VFD enclosure tonight. Its a heavy duty steel Schneider enclosure, I'll be taking advantage of the VFDs thermal design by mounting it sideways to create the right air flow as per spec, there will be a fan at the top left of the enclose that will turn on when the VFD heatsink hits 85% thermal capacity and air intake on the bottom left - both will be filtered. It is handy having a lathe, I turned some custom standoffs for the VFD mounting plate in under 10 mins something that normally means a purchase :-). The Heavy Duty Brake Resistor is mounted on the outside and I made a cover to protect it. Now the main fabrication is done I can paint it to match the lathe then properly install and wire it all up.

    Below final position of components. High voltage cables will be routed up the rear of the VFD between the standoffs and all the control cables will be to the front to avoid interference. It's just the contactor and a 12v Transformer on the DIN rail which will power the Enclosure Fan and the Spindle Tacho.
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    Knocked up a basic cover to protect the resistor.
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    All mounted, painting next.

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  11. R-D-R Forum Supporter

    Messages:
    1,137
    Location:
    Derbyshire - England
    Box painted and mounted, Kopex gland holes and Fan holes next.

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  12. Carl Wilson Member

    Messages:
    1,742
    Location:
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    Looks the business.
     
  13. slim_boy_fat

    slim_boy_fat Forum Supporter

    Agree, the one for the holders looks favourite, thanks @R-D-R :thumbup:
     
  14. addjunkie

    addjunkie Member

    Messages:
    6,132
    Location:
    Northumberland. Reet oot in the sticks
    I have one similar, but bolted through the top edge of the splash back. Though when I working I use a roll cab pulled out with a plastic tray from a cafe on top, stops small drills and stuff rolling away into swarf. Also somewhere for the cup to stand.
     
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  15. slim_boy_fat

    slim_boy_fat Forum Supporter

    Got a pic [or two]? "Adopt, Adapt, Improve" as the Round Tablers would say ;)
     
  16. Dieselkid 63

    Dieselkid 63 Banned from forklifts

    Messages:
    4,611
    Location:
    Wellington, New Zealand
    How do you even learn how to do this stuff? I’m dumbfounded when it comes to electrics, I would love to build an enclosure like that but I just have no clue as to where to start.
     
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  17. addjunkie

    addjunkie Member

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    6,132
    Location:
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    eLuSiVeMiTe and slim_boy_fat like this.
  18. RichardM Member

    Enclosure - just a thought with the braking resistor adding to the heat, will there be enough though flow of air to keep the vfd cool?
     
  19. addjunkie

    addjunkie Member

    Messages:
    6,132
    Location:
    Northumberland. Reet oot in the sticks
    Computer fan!
     
  20. R-D-R Forum Supporter

    Messages:
    1,137
    Location:
    Derbyshire - England
    I was worried about the Resistor producing heat, for the use I have given it so far its never got even warm. I did choose to mount it on the outside to be safe and then I have added a computer fan to the top to draw air out of the enclosure. This fan will be controlled by the VFD and programmed to kick in when the heatsink hits 85% of its max working temperature.

    Modified the top plate to take the fan

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    mounted on the box
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    there will be intake holes at the bottom protected by a filter.
     
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