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Type: Posts; User: peteeng

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  1. Re: CNC stepper (?) motors have power & signal but won't move

    Hi Neal - sorry no feedback at all, zero, nadda, zip. The DRO only counts the controller steps and assumes its correct. If the motor skips a step due to an overload that skip exists until you re-zero...
  2. Re: CNC stepper (?) motors have power & signal but won't move

    Hi Neal - I'm not a M3 user so can't help there. But with a stepper system there is no feedback to the controller. The controller sends out a step and direction impulse and does not know if the motor...
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    Re: Milli a new composite mill kit

    Hi JTS - The saddle on a machine is the part that allows two axis to move at once 90deg to each other. On a gantry machine this is the part that allows the X and Z to move. It means the Z axis is...
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    Re: Milli a new composite mill kit

    Hi Klaas - That requires a saddle and a tall Z axis, both have issues that the moving column fixes. Every configuration has pros and cons. A tall fixed gantry with a high Z has lots of flex as well....
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    Re: Milli a new composite mill kit

    Hi All - I did some generative work this morning. I haven't read up on the background to how Inventor and Fusion do this solutionbut I have read a paper by the solvers author before autodesk bought...
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    Re: Milli a new composite mill kit

    the wonders of simple models - I made the column 300x300 and the deflection dropped from 70 to 44um. all good time to pack up... Peter
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    Re: Milli a new composite mill kit

    GooooD Evening - I've started No8 Round2. I'm going to approach this different to usual. Usually I build many parts and test and review and review etc.I suppose that's because of the sheet metal...
  8. Thread: Z axis play

    by peteeng
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    Re: Z axis play

    Hi Lodds - you can fill the extrusion with expanding concrete. Not normal concrete. Concrete is about the same stiffness as aluminium so the fill is a good match and it will considerably stiffen the...
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    Re: Milli a new composite mill kit

    Hi Spumco - you don't need to compensate for the force side. As long as you have as an accurate as possible force number. The important thing is to measure the deflection as accurate as possible as...
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    Re: Milli a new composite mill kit

    Hi Spumco - Generally it goes like this. 1) place a large solid bit or round stock in the collet. Some stock is safer as its not sharp. 2) Place a dial guage on one side of the bit (some square stock...
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    Re: Milli a new composite mill kit

    Hi All - I'm still struggling to find static stiffness data on small mills. Seems they are around 1N/um...
    stiffness measurements cnc mk3
    ...
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    Re: Milli a new composite mill kit

    Hi All - I meant to show how I determined the round column size. The "pad" for the column is 250mm square so a Dia250 column is the current max size. I calculated the second moment of inertia of a...
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    Re: Milli a new composite mill kit

    OK all you lot settle down - So to summarise Round 1

    R1 objective was to study three machine configs to determine the direction for the actual machine. a) lifting gantry b) moving column c)...
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    Re: Milli a new composite mill kit

    Hi Pippin - I'm about to adjust dimensions from the spindle backwards. This series, Round 1 was built from the premise of a footprint of 1000x1000mm to see what happens. Some parts have sort of grown...
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    Re: Milli a new composite mill kit

    Hi All- Something like this - Peter
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    Re: Milli a new composite mill kit

    Hi All - I changed the base thickness from 100mm to 150mm and reran the loads. This improved the figures from No5 to No7. The tombstone is still better in X (column torsion) mode. In the No7 rebuild...
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    Re: Milli a new composite mill kit

    Hi Pippin with 1000N applied to the axes at 50mm below the collet...

    No5 Mill X 21um Y 8um and Z 17um (Moving column)
    No6 Mill X 14um Y 8um and Z 16um (tombstone mill) 10um per 1000N is...
  18. Re: CNC router build to machine wood and aluminium (1mX1mX0.4m)

    Hi Rupesh - The dwgs are a little unclear to me. But I'll put fwd something. How about using a square hollow section bolted to the column side? Plus a machinist would never have their clamps inclined...
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    Re: Milli a new composite mill kit

    Hi Pippin,
    I'll do the transverse case for the record and Z. But in any case it would seem the base has to be thicker. Cheers Peter
  20. Re: CNC router build to machine wood and aluminium (1mX1mX0.4m)

    Hi Rupesh - welding (TIG or other) will warp your parts. So don't weld. Using construction brackets or edge bolting is good enough.. Good luck Peter
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    Re: Milli a new composite mill kit

    Hi All - Its magic - I organised No5 and No6 into the same height and depth. I then made all parts steel to represent the max stiffness it could be. No5 weighs 1.26 tonne and No6 weighs 1.77 tonnes. ...
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    Re: Milli a new composite mill kit

    Hello all you cnc lurkers out there;

    I've started Milli No6. It's a combo of ideas. There are machines with rear "walls" and double columns like the vulcan but they usually have twin high rails,...
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    Re: Milli a new composite mill kit

    Hi Spumco - Very nice work. Very tidy wiring, I think your screwdrivers could be better organised to match... :) Can't live without forceps. Just finished the wiring diagrams for the sparky for my...
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    Re: Milli a new composite mill kit

    this one - Peter
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    Re: Milli a new composite mill kit

    Hi Spumco - Thanks for the "summary". All my machines are designed as production machines so need a consistent source for parts. So DMM is looking good. I'll have to read your summary a few times for...
  26. Re: Moving Gantry column bearing spacing - open discussion

    Hi Jawz - You have one hour to edit a post, after that its frozen. So you will have to add the info in another post. Combined axis loads are not quoted. Machines are linear so if you wanted to know...
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    Re: Milli a new composite mill kit

    Hi Pippin - There's probably not a magic bullet design that solves all the issues to milling something. In 10 years time mills may not exist as we know it. They will be 3D printers with finish...
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    Re: Milli a new composite mill kit

    Hi All - I have "talked" briefly to DMM and and their DST 130mm frame seems to be the go. The 130mm frame has 3 power options 1.0, 1.3 and 1.8kW. So the owner could choose or upgrade as needed. I...
  29. Re: Moving Gantry column bearing spacing - open discussion

    Hi Anders - Could you upload the images into the forum via the advanced features? links fail over time and some of the images are smaller then small stamps for some reason. What really matters with...
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    Re: Milli a new composite mill kit

    Hi All - This may seem an odd thought but why aren't steppers used for spindle drives? is it the intermittent motion? or the speed range? A 1000W servo can do 3Nm continuous so can a stepper? The...
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