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  1. M

    BT30 hoder in a ISO30 spindle, can it work ?

    Thanks, please pardon my ignorance, what is the pilot ? Is the drawbar for the BT30 tool holder straight forward to make ?
  2. M

    BT30 hoder in a ISO30 spindle, can it work ?

    I have read that using BT30 holders in an ISO30 spindle is possible IF a specialized drawbar can be made. Is this correct ? If yes, can the drawbar for MT30 be made with a lathe and a mill ?
  3. M

    Are end mill shank diameter always less than nominal size ?

    Given that ER collets still work with slightly smaller endmills, and that bad things happen when end mills are oversized, is there a standard (or industry best practice) that require end mill shanks to be slightly undersized (less than nominal size), in order to bring the probability of endmills...
  4. M

    Iso30 vs R8 mill spindle

    The ER collets that you use, aren't they in an R8-to-ER chuck ? If so, won't the runout of the chuck and of the ER collets add up ?
  5. M

    Iso30 vs R8 mill spindle

    One advantage (at least a theoretical one) I can see for R8 over the Iso30, is that holding straight shank endmills, the iso30 setup has one more component (a collet chuck), example : A) ISO30 Setup: ISO30-spindle < collet-chuck < er32-collet < endmill B) R8 Setup: R8-spindle <...
  6. M

    Iso30 vs R8 mill spindle

    I'm considering getting a manual bench mill that can be supplied with either an MT3, ISO30, or R8 spindle. It's my first mill, and I have no tools yet, I want chose the spindle type that I won't regret later. From what I've read, morse tapers aren't great for milling, so unless I hear...
  7. M

    Ensuring the coat of prussian blue on the granite is thick enough, but not too thick

    It seems that a compromise/optimum is needed to obtain the right thickness of paint spread on the granite: not enough paint, and the blue will be very faint, hardly visible, too much paint, and you get "fake" high spots, in the extreme, even the lowest spots become blue, I watched some videos...
  8. M

    Is there a reason to not lap instrument surfaces (straight edge, etc) after scraping ?

    I understand that for sliding surfaces (dovetail, etc.,) the pockets left by scraping are desirable, because they allow oil to remain longer between surfaces. I was wondering if, for instruments like straight edges, it would be a good or bad idea to lap the surfaces after scraping. For...
  9. M

    Should the sliding surfaces of a buck chuck be oiled ?

    Perhaps I wasn't clear: the sliding surfaces I wrote about are the ones that slide against each other during the fine adjustment of the chuck for runout correction. In other words, the surfaces that slide on two axis when the 4 screws are adjusted. They don't move much, but they must move...
  10. M

    Should the sliding surfaces of a buck chuck be oiled ?

    I dissembled a buck chuck for a clean up, and I'm wondering if the bearing surfaces that slide against one another during the adjustments (perpendicular to the rotation axis), should be oiled, and if so, what kind of oil. I'm thinking that way oil would be a good option, but wanted to enquire.
  11. M

    Why would someone put a 0.1mm shim under a Hardinge HLV headstock ?

    There doesn't appear to be a shim under the bed plate, but I did not remove it. I know there are "schools of thought" on weather a bed plate can be removed and put back without adverse effects, I found the horror stories rather convincing, so I chose non intervention in this case !
  12. M

    Why would someone put a 0.1mm shim under a Hardinge HLV headstock ?

    Based on what ? Everything about the lathe (even the serial number) is HLV (non H): dovetail is just under 5" wide, screws to bed from inside the headstock, etc...
  13. M

    Can a lathe be lifted by the spindle and still have any precision left ?

    It's not so much the spindle bearings that would worry me, but the screws holding the tailstock to the bed. It also look like the belt at the other end tied to the bed is exerting huge upward force on the saddle, and whatever is holding the saddle down is not meant to hold that much force. As...
  14. M

    Why would someone put a 0.1mm shim under a Hardinge HLV headstock ?

    Ok, I put back the headstock, with the shim, and the tailstock deadcenter align perfectly with a pin held by a 5c collet in the spindle. The shim is there for a good reason. I'm still curious as to when the shim was added, and why. The tailstock has turcite under it, I believe it's the cas...
  15. M

    Why would someone put a 0.1mm shim under a Hardinge HLV headstock ?

    I removed the headstock of my newly aquired 1956 Hardinge HLV-BK, and there was a 0.1mm brass shim between it and the bed. I've read about many instances of elevating the tailstock after a bed grind, can't think of a reason to elevate a headstock, other than wanting to align to an elevated...
  16. M

    Can a lathe be lifted by the spindle and still have any precision left ?

    I came across this photo for a lathe that will be up for auction. Is it fair to say that what ever precision was left in the spindle, it's now destroyed ?
  17. M

    Motor swap and VFD conversion for a Hardinge HLV

    I have nothing against going cheep-azz, in fact I'm quite tempted by this ATO 5HP : https://www.ato.com/5hp-vfd judging from the manual, it seems pretty good : https://www.ato.com/Content/doc/gk3000-variable-frequency-drive-user-manual.pdf Besides being half the cost of a DuraPulse, it could...
  18. M

    Motor swap and VFD conversion for a Hardinge HLV

    Possible ! And now that I've looked around, I noticed that good deals on 5hp motors are more common than I thought. As for VFDs, it's another story, the ones that can drive a 5hp while fed single phase current are pretty expensive, unless I get one of the Chinese brands that sell on amazon...
  19. M

    Motor swap and VFD conversion for a Hardinge HLV

    The 5hp motor solution seemed like the best choice, but then I stumbled on a "like new" 2HP Baldor SuperE motor at 1/5 the cost, at 20 minutes driving distance, and bought it. According to the calculations below (based on the principle that HP degrades proportionally to RPM below 60hz), the 2hp...
  20. M

    Help understand this torque vs RPM chart

    The sheet on the Baldor site is the same as the one I posted. Just to make sure I understand the rule of the thumb, is the following correct : 60 Hz (1755 RPM) -> 2HP 30 Hz (878 RPM) -> 1HP 15 Hz (439 RPM) -> 0.5HP 7.5 Hz (219.5 RPM) -> 0.25HP ? I'm trying to see how well this Baldor motor...
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