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  1. Replies
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    For the lubrication. I scrapped the entire...

    For the lubrication. I scrapped the entire distribution system, meters, pipes and joints.
    Purchased an entire system with flexible lines and another pump.
    One pump for slideway oil and one for the...
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    sossity, You posted while I was writing ! ...

    sossity,
    You posted while I was writing !

    More great photos.
    I had good access to the knee interior and cleaned out aluminium swarf, not as much as yours.
    The mill had been used to make racing...
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    pipeclay, This is only a re-commission, not a...

    pipeclay,
    This is only a re-commission, not a re-build, so removing the knee was never on the plan.

    Removing the clamp plungers is only part of a general clean, check, modify/correct as...
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    Kondia Turret Mill - Knee Clamps

    I am cleaning up this mill and re-commissioning it with CNC (so far got steppers rotating on the floor).
    Currently the knee gib is out and I am trying to clean the various knee mating surfaces.
    ...
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    New Rail Bridge at Penrith

    The new rail bridge for the Main West railway over Castlereagh Rd in Penrith will be a concrete through-arch, replacing the existing steel through-beams.

    The new bridge has been erected at right...
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    Roger, Thanks for the comments. Loved the...

    Roger,
    Thanks for the comments.
    Loved the bucket photo, I use a re-cycled food tray on the bench.
    The reason I chickened out on the size increase was just the risks you mentioned.
    I was chasing...
  7. Replies
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    Loaded the nut with 2x54 new balls, clearance...

    Loaded the nut with 2x54 new balls, clearance seems adequate, but way less than another ball.

    Installed on screw and tested the vertical friction with the shipment oil (very light).
    Still too...
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    Success, re-balled. Balls arrived today in a...

    Success, re-balled.

    Balls arrived today in a nice parcel.
    They glisten in oil in a vacuum sealed plastic bag.

    They switched batches on me, but the size is the same, 6.368542 mm.
    Their...
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    Some success. Sent email to Bal-tec and one of...

    Some success.

    Sent email to Bal-tec and one of the staff replied with suggestion I call them and ask for her.
    I called and she took down my credit card details, no problem at all.

    Couple of...
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    Why is it so hard ! Was always troubled by the...

    Why is it so hard !

    Was always troubled by the discrepancy between the DTI and micrometers for ball diameter.
    So I re-did all the measurements with two inspection grade B&S and Mitutoyo...
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    Michael, My understanding is that the groove on...

    Michael,
    My understanding is that the groove on the nut and screw is two separate curves, and each may not be circular.
    Depending on the direction, the nut has single-point contact to a ball on one...
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    Ball size measurement was discussed in a parallel...

    Ball size measurement was discussed in a parallel thread:
    https://metalworkforums.com/f65/t203957-chrome-steel-ball-measure-digital-micrometer

    The size determined was a distribution:
    - 1%...
  13. Metrology is hard ! Miniscule variations in...

    Metrology is hard !
    Miniscule variations in procedures, environment and temperatures give significant variations.

    My mate arrived with his Mitutoyo 4 digit metric digital micrometer (with mirror...
  14. Dave, Thanks for the comments. Some progress:...

    Dave,
    Thanks for the comments.

    Some progress:
    1. A good mate has a Mitutoyo 3 or 4 digit metric digital micrometer, with a nice stand.
    As soon as practicable, I will visit with my balls and we...
  15. elanjacobs, You posted while I was writing ! ...

    elanjacobs,
    You posted while I was writing !

    That is a very kind offer.
    Lets give it a few days, then I will PM you if I need to take you up on it.

    John
  16. The surface plate approach has appeal. I tried a...

    The surface plate approach has appeal.
    I tried a set-up, but couldn't convince myself of its repeatability/accuracy.
    I don't need a quality Go-Nogo gauge, I want an absolute measure to a few...
  17. Chrome Steel Ball Measure with Digital Micrometer

    I currently have a thread running that describes issues with the X-axis ball screw off my CNC turrett mill:
    - https://metalworkforums.com/f308/t203555-ballscrew-nut-re-fit.
    My focus at the moment...
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    I think the ball size is determined by the fit to...

    I think the ball size is determined by the fit to the screw groove, it affects the pre-load, backlash and friction factors.
    The balls in the path length simply need 'working clearance', currently...
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    Loaded the nut and mounted on the screw, twice...

    Loaded the nut and mounted on the screw, twice
    The complete process is simple and trouble free.
    The nut even balances on the transfer tube and spacer without need of a supporting stand.
    Easy to...
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    Continued the trial fit, no need for the vacuum,...

    Continued the trial fit, no need for the vacuum, just drop the ball into the vertical jigged assembly and let gravity do its job.
    Can even drop multiple balls and stir with a small screwdriver !...
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    Made the transfer tube end plug. Went down to...

    Made the transfer tube end plug.

    Went down to CBC in Penrith for a chat, left with 110 x 1/4" balls for under $14.
    Apparently special sizes are ordered through their system and I could do better...
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    The table end cap has solid metal in line with...

    The table end cap has solid metal in line with the T-slots (probably to prevent damage).
    I can fill the table T-slot ends and then drill for dowels after fitting the end cap and testing.

    Made a...
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    Checked all the balls, 102 x 6.365 and 1 x 6.355,...

    Checked all the balls, 102 x 6.365 and 1 x 6.355, so at least one ball has been lost.
    I will reload with the small ball in the 52 group, the 51 group being all large balls.

    In addition to loading...
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    Never got a response from the website. Spent a...

    Never got a response from the website.

    Spent a couple of weeks looking for a S. Korean speaking person to translate the site for me, and eventually found one.
    Called the listed number and...
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    August lunch is at Penrith RSL, 1200 h in the...

    August lunch is at Penrith RSL, 1200 h in the buffet, all welcome.

    I will have some parts from my CNC mill ballscrew to show.

    John.
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    From the amount of views, this subject is of some...

    From the amount of views, this subject is of some interest.
    Not much progress to date, stalled out trying to contact the Korean web site.

    My web searching tells me the best approach to mount the...
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    Had a discussion with my acquaintance about...

    Had a discussion with my acquaintance about realistic pricing.

    He will now accept $1500.

    Note: seller cannot assist in removal of the 180+ kg. lathe.
    Extraction would not be difficult, but it...
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    DHL package delivered yesterday, very nicely...

    DHL package delivered yesterday, very nicely packed.

    First impressions are good, nice 'feel' of all the unit parts.
    One surprise, the input is at the top, together with the RS485 port.
    Not a...
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    Michael, The problem with a new fabrication is...

    Michael,
    The problem with a new fabrication is the special machining at the ends - it would take multiple attempts to get it correct.

    One small step forward was a quote/order on a Chinese company...
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    Attached is one of the ball return tubes showing...

    Attached is one of the ball return tubes showing the damage inflicted by a previous worker (!). 380823 This tube, and its mate, would still operate but they are clearly not ideal. The other parts...
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    Lathe H&F 250 G

    An acquaintance in the local Mens Shed wants to gain some room in his workshop, so his 'big' lathe has got to go.
    The 'small lathe' is a Proxxon, as is a number of other tools, primarily CNC and...
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    Harrison M250. For Dave J (and other members)...

    Harrison M250.

    For Dave J (and other members) who would say, "without the photos it didn't happen" :

    380711, 380710, 380709, 380708,

    The motor mounted disc looks and feels like bakelite....
  33. Replies
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    Quote was in USD. PayPal fee USD 13.16. John.

    Quote was in USD.
    PayPal fee USD 13.16.

    John.
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    Lathe Mechanical E-Stop

    My M250 lathe was originally fitted with a mechanical E-Stop assembly on the rear of the motor.
    It is a shaft mounted plastic disc between two plates, one fixed, one floating axially against axial...
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    Responded to Powtran with my public PayPal...

    Responded to Powtran with my public PayPal details.

    They replied with an invoice that they stated had been submitted to my PayPal account.

    Got an email from PayPal stating I had an outstanding...
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    From the quotation: 5. What is your Paypal...

    From the quotation:

    5. What is your Paypal account? so the PI could be made for you soon after confirmation
    Daniel.

    My sending to an email address is Ok for me.
    John
  37. Replies
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    Got the quote for PI130 2R2G1(Z) units. Placed...

    Got the quote for PI130 2R2G1(Z) units.
    Placed an order for 2 units with resistors, now have to negotiate a PayPal payment.

    It sort of looks like they think they can charge my account, but I...
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    Thanks Bob, My lathe fan noise can be annoying...

    Thanks Bob,

    My lathe fan noise can be annoying at times because my workbench runs along the back of the lathe and the favourite end for bench working has me face-on to the VFD.
    (Of course a...
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    I am also interested in a VFD for my CNC mill -...

    I am also interested in a VFD for my CNC mill - 2.2 kW 240 V to 240V 3-ph.
    No fancy complications needed.

    My original Huangyang (SG) has a fan that starts/stops automatically, my newer SAJ...
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    Our get-together this month is Tuesday 9Jul19 at...

    Our get-together this month is Tuesday 9Jul19 at St Marys L.C.

    My attendance is subject to being sufficiently recovered (ie not infectious) from a good dose of cold/flu acquired last week during a...
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    Thanks for the suggestion, I wondered whether...

    Thanks for the suggestion, I wondered whether that was a viable method.
    My nut has 2 return tubes, with each end buried within the nut when the retaining clamp is fitted.
    It will need quite a bit...
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    Ballscrew Nut Re-fit

    My CNC re-furbish project on a Kondia turrett mill has languished for a few years.
    But, I can now devote some time to it and the first issue has arisen.

    The X-axis ball screw nut was separated...
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    Harrison M250 Carriage Stop

    The stop body is CI, the balance black steel and 1214.
    The body was originally a TAFE offcut of 75 x 75 mm extruded bar, squared in the lathe, bandsaw to divide.

    The adjustable stud is 12x1 mm...
  44. Yes, I keep considering DRO, the phamplets from...

    Yes, I keep considering DRO, the phamplets from H&F are always tempting.

    Removed the GMT barrel from the thrust bearing housing, carefully as dis-assembly of the barrel involves springs and balls...
  45. I have a thread running on this subject on the...

    I have a thread running on this subject on the Yahoo Groups site and attached is the parts break-down for the M300 that was posted to assist.
    It is different to my GMT branded M250 in details, but...
  46. Harrison M250 Cross-slide Dual Scale Problems

    My M250 has always exhibited slipping of the dials on the cross-slide, initially not too serious and easy too recognize and allow for.

    But it got worse during a recent screw-cutting job and the...
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    Password Manager

    I am running Firefox on Linux.
    Just installed a password manager, KeePassXC.

    Having problems getting the manager to launch Firefox, then the Forum and then populate the Username and Password...
  48. In the model engineering hobby, square stock is...

    In the model engineering hobby, square stock is frequently held my making a cylindrical bush in the 3-jaw, ID the same as the square stock across the diagonal, OD a few mm larger (say 5 mm for ID 15...
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    The first lunch of the winter season will be this...

    The first lunch of the winter season will be this coming Tuesday, 14May, at St Marys L.C.
    Nice selection of roasts and veges to warm the discussions.
    All welcomed at 1200 h in the foyer, then the...
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    Following is a photo of the subject chuck jaw. ...

    Following is a photo of the subject chuck jaw.

    379319

    I have 4 chucks, all with tip radii approx 25 mm:
    - subject 3-jaw tip is 7 mm wide and shows evidence of previous grinding.
    - new 3-jaw...
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