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Type: Posts; User: llilrex

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  1. Replies
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    Re: lathe tool and work offsets

    Yes I do, I use it to sync screw compensation. Home switches on both axis.
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    lathe tool and work offsets

    I have been running my converted lathe for a while now. but a problem keeps bugging me, I have a workaround but I would like to solve the problem the correct way.

    G54 (Sets work space)
    T0 M6 G43...
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    Re: Turning 4140 30-45 HRC

    here is a video of the cut

    https://youtu.be/8A_D0vjkYYE
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    Turning 4140 30-45 HRC

    I am turning Drill steel used in oil drilling operations. to the best of my knowledge it is 4140 at about 40HRC, it turns pretty closely to 4140 QT. I want to improve my cycle times and have been...
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    Re: mgn12 rail stiffness?

    peter, so obvious of a solution, and simple with a lot of advantages. I am a little mift that I didn't think of that.

    elfrench, I will most probably not be gluing the cars to the X carriage....
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    [QUOTE=peteeng;2446054]Hi Ray - Nature would...

    [QUOTE=peteeng;2446054]Hi Ray - Nature would never build something with absolute regular spacing. If you make one of those thin plates by accident the correct size that vibrates you will have a huge...
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    Re: mgn12 rail stiffness?

    This is what I am getting ready to run FEA on. I am still working on it but I decided to make life hard and weld up a frame out of 16gauge sheet steel. The machine stiffness should be way higher then...
  8. Re: Welded Steel Frame VMC-Interpreting simulation results

    those physical tests are what I would expect to see, I must have interpreted your FEA wrong. the 100N thing is a normalized test. if I were to apply it to your tests it would be something like:
    ...
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    Poll: Re: How fast is your homemade CNC?

    I converted a colchester clausing mastiff, I had to slow it down, 600 ipm rapids on the x axis is too fast. I limit it to 100 ipm usually to give me half a chance to hit the estop. most of the time...
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    Re: mgn12 rail stiffness?

    yeah 68 for 6061 and 71 for 7071 (according to google), not much of a difference.
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    Re: Need 4000kgf and only got 10cm room....how?

    you could try an air spring. https://www.mcmaster.com/9539K48 this will actuate 3991kgf at 100PSI air pressure and is only 2.6 (6.6cm) inches when not actuated.
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    Re: mgn12 rail stiffness?

    sounds good to me. for my current project I have crap lying around that I am going to play with. I have over looked them many times in favor of other better rails. I think I originally got these for...
  13. Re: Welded Steel Frame VMC-Interpreting simulation results

    looks pretty nice. are you expecting 1000lbs of torque on the column? I am just wondering what type of machine you are going for. high HP low torque or High torque low HP. looking at the ratios of...
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    mgn12 rail stiffness?

    Anyone know the approximate stiffness values for mgn12 block and rail or similar? I am going to do some fea simulations but I would appreciate corroboration if anyone has any.

    thanks,
  15. Re: Need help calculating cutting forces for CNC Routing

    I would start by finding the torque that your spindle will produce. This will be the maximum cutting force that your machine will see. If you are running 12mm with a 5.6KW spindle @ 24000 RPM the...
  16. Re: Welded Steel Frame VMC-Interpreting simulation results

    looks great! I am interested in how it performs. I think there are a lot of methods available to damp the structure. and it looks like it will have good stiffness for accuracy in cut as well as...
  17. Re: a simple live tooling attachment to a CNC lathe

    the heating elements are Kanthel 110V 1600W each, the furnace is fairly well insulated with light firebrick, I am using a heavy duity exposed K type Thermocouple, the elements are controlled with a...
  18. Re: a simple live tooling attachment to a CNC lathe

    there are two elements, totalling 2600W I have a furnace controller on it too in order to control the maximum furnace temp. I am not usually in a hurry, but I think it takes about two hours to melt...
  19. Re: a simple live tooling attachment to a CNC lathe

    thanks,

    I used petrobond, with an electric furnace. this picture is from the melt on this project. I have since fixed the element that fell from its groove.
  20. Re: a simple live tooling attachment to a CNC lathe

    The design starts with the spindle casting, I modeled it with fusion360, then 3d printed it, I used the 3d printed part as a pattern to sand cast it. it was the first time I used a 3d printed part as...
  21. a simple live tooling attachment to a CNC lathe

    it has been a while since I have posted. so I figured that its about time I be a bit more active.

    I decided I needed a live tooling spindle on my lathe, my concept is that it will be mounted on a...
  22. Thread: G76 issue

    by llilrex
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    G76 issue

    I am threading an 8-acme inside thread, I set the Q to 14, however the cut angle is much greater than that. probably closer to 20 or even as much as 25 degrees. when I cut a 60 degree thread and set...
  23. Re: 1.st stage axial compressor designed with DIY automated CAD construction workflow

    have you estimated the stage compression ratio? At such a small scale the blade airfoil matters less due to the Reynolds number. what is the compression ratio that you are shooting for when you have...
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    Dual spindle lathe

    Well it looks like this is the forum to post builds. So here is mine.... A long time coming. I have made lathes before but this is my most ambitious project yet. I have had this plan for years but...
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    Well I decided to do it 30mm x 10mm lead, here...

    Well I decided to do it 30mm x 10mm lead, here are some pics. I constructed a steady rest for the project and made a form tool. There is a small amount of chatter. I am looking forward to test its...
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    Re: homemade ballscrew

    ger21, thanks for the force estimate. I was originally thinking about a gantry router with about 2 hp spindle. I might try it on a metalworking lathe project I am working on. I have an old textbook...
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    homemade ballscrew

    I am wondering if anyone here has attempted to make a ballscrew? Also I am used to working with hardened ballscrews, but I know that some ballscrews are made from relatively soft material, and...
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    Yasnac MX1 machine control comm

    I have my machine hooked up to a DNC program on a computer. it transmits the data reliably only part of the time. I can correct this by removeing all of the end of block characters that do not...
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    Matsuura spindle speed

    I have an old Matsuura, it is a 760V circa 1983. I plan on running some aluminum parts on it. the spindle speed maximum on this machine is 6000RPM, my question is by experiance, how reliable is the...
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    my sand isn’t right. it wont release. also I...

    my sand isn’t right. it wont release. also I don’t have enough sand. this puts a damper on things. unfortunately the lack of sand makes the coup and drag design more difficult. I have been having...
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