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Thread: HF 8x14 linear rail conversion....and maybe more...

  1. #61
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    Default Re: HF 8x14 linear rail conversion....and maybe more...

    Looks like the model! Nice work. I just found out I'm going to have two months off, unemployment is currently MORE than my regular paycheck, so I do believe I will be finishing my lathe. Planning to use your turret design, thanks!



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    Default Re: HF 8x14 linear rail conversion....and maybe more...

    Please do! i've made a few changes that you'll want to incorporate. Here's the new model everyone...


    https://drive.google.com/open?id=15V...hjfZlfLjhbTKS9



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    Default Re: HF 8x14 linear rail conversion....and maybe more...

    After i got all my grown up chores done today I got to play again and it turns out there was nothing wrong with the bearing....I just had a blond moment. The bearing race actually sticks out past the bearing race and the opening in my mounting plate wasn't large enough to clear it so every time I put pressure with the nut it bound up....I opened up the clearance pocket and now it's good to go. This is one of the changes made to the CAD model.
    HF 8x14 linear rail conversion....and maybe more...-20200426_131028-jpg

    So once i got that done I finally fabricated the two ratchet arms. I ended up welding little pins into them for a spring connection. My tolerances were a bit tight so some grinding was required. While i was at it, i ground in a little retaining notch that the loop on the spring hooks into. You can also see there is also a little pocket on the side that I use along with a pin in the front plate that acts as a hard stop to locate the arm when it's in the "lock" position.
    HF 8x14 linear rail conversion....and maybe more...-20200426_154148-jpg

    Here you can see the guts. The springs ride in the little tracks and pulls the arms into the stop pins. My springs are a wee bit long so I may replace them, or i may try to cut a few coils off them and reform the hook. You can see the stop pin here as well, and you can see the arm on the right is against the stop pin and can not rotate in towards the bearing any farther.
    HF 8x14 linear rail conversion....and maybe more...-20200426_154206-jpg

    So once I had the stop pins in I realized there was a slight clearance issue with the ratchet paw and the pins. So I decided the best fix was to machine a bit off the backside of the paw. BUT I had already pressed the bearing into place so i had to cover it the best i could. I ended up machining about .03" off the backside of the paw which fixed everything. I also added this change to the new CAD model.
    HF 8x14 linear rail conversion....and maybe more...-20200426_153420-jpg

    All assembled and it has such a gratifying click every time it increments. And some of you may be wondering why the heck I have two arms. Well by adding an additional arm I doubled the number of stations on the turret without having to make the paw contact pads smaller. So i'll have 6 regular tool holders and in between each of those I'll have the option to mount drills or boring bars. Still not 100% sure what i'm doing yet.
    HF 8x14 linear rail conversion....and maybe more...-20200426_155210-jpg


    But that wasn't it for today! I also got the first two cams that secure the tool to the turret. They operate on the same principal as the low profile mittebite clamps. I thought about just buying some of them, but they are like $6 a piece and i need 12 of them. So here you can see the eccentric cam profile in both the screw and the clamp.
    HF 8x14 linear rail conversion....and maybe more...-20200426_171313-jpg

    installed:
    HF 8x14 linear rail conversion....and maybe more...-20200426_171327-jpg

    and with a tool installed. They work REALLY good, but i need about .010 worth of shims, so some adjustments will be made to the cams.
    HF 8x14 linear rail conversion....and maybe more...-20200426_171229-jpg

    Attached Thumbnails Attached Thumbnails HF 8x14 linear rail conversion....and maybe more...-20200426_131028-jpg   HF 8x14 linear rail conversion....and maybe more...-20200426_154148-jpg   HF 8x14 linear rail conversion....and maybe more...-20200426_154206-jpg   HF 8x14 linear rail conversion....and maybe more...-20200426_153420-jpg  

    HF 8x14 linear rail conversion....and maybe more...-20200426_155210-jpg   HF 8x14 linear rail conversion....and maybe more...-20200426_171313-jpg   HF 8x14 linear rail conversion....and maybe more...-20200426_171327-jpg   HF 8x14 linear rail conversion....and maybe more...-20200426_171229-jpg  



  4. #64
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    Default Re: HF 8x14 linear rail conversion....and maybe more...

    I'm impressied! Glad you are updating the CAD as you work out the kinks, I am not one bit ashamed to say I'll wait for you to get this running before I start cutting. At the rate you are moving, I'll be able to start about Wednesday!



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    Default Re: HF 8x14 linear rail conversion....and maybe more...

    If anyone is good with VB programming maybe you can see what I'm doing wrong...I get a compile error anytime I try to do a tool change in mach3

    Dim Num_Tools As Integer
    Dim Ang_Move As Integer
    Dim Req_Tool As Integer
    Dim Current_Tool As Integer
    Dim Lock_Move As Integer
    Dim CW_Feed As Integer
    Dim CCW_Feed As Integer
    Dim Moves As Integer


    Num_Tools = 12 'number of tools on turret
    Ang_Move = 360/Num_Tools 'angular rotation per tool
    Req_Tool = GetSelectedTool()
    Current_Tool = GetCurrentTool()
    Lock_Move=15 'distance to move back onto paw to lock
    CW_Feed=100
    CCW_Feed=50

    'Start tool change

    If Req_Tool < 1 Then
    Message"Tool number too low"
    Code "M30"
    End If

    If Req_Tool = Current_Tool Then
    'do nothing
    Else
    'do tool change
    If Req_Tool > Current_Tool Then Moves = (Req_Tool - Current_Tool) * Ang_Move
    Else
    If Req_Tool < Current_Tool Then Moves = (Num_Tools - Current_Tool + Req_Tool) * Ang_Move
    End If

    'move to safe position
    Code "G0 G53 X-.25 Z-.25"
    Code "G04 P0.5"
    'index turret
    Code "G91 G94"
    Code "G01 A" & Moves + 10 & "F" & CW_Feed
    Code "G01 A-" & Lock_Move & "F" & CCW_Feed
    While IsMoving()
    Sleep(10)
    Wend

    SetCurrentTool Req_Tool
    SetUserDRO 1500 , Req_tool
    Code "G90"
    Code "F" & Current_Feed



  6. #66
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    Default Re: HF 8x14 linear rail conversion....and maybe more...

    Did you figure this out? How's progress going?



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    Default Re: HF 8x14 linear rail conversion....and maybe more...

    I did not. One of the nice people on the mach support forum figured it out and it's indexing like a charm. Here's the fixed code:

    Dim Num_Tools As Integer
    Dim Ang_Move As Integer
    Dim Req_Tool As Integer
    Dim Current_Tool As Integer
    Dim Lock_Move As Integer
    Dim CW_Feed As Integer
    Dim CCW_Feed As Integer
    Dim Moves As Integer


    Num_Tools = 12 'number of tools on turret
    Ang_Move = 360/Num_Tools 'angular rotation per tool
    Req_Tool = GetSelectedTool()
    Current_Tool = GetCurrentTool()
    Lock_Move = 15 'distance to move back onto paw to lock
    CW_Feed = 100
    CCW_Feed = 50

    'Start tool change

    If Req_Tool < 1 Then
    Message"Tool number too low"
    Code "M30"
    End If

    If Req_Tool = Current_Tool Then
    'do nothing
    Else
    'do tool change
    If Req_Tool > Current_Tool Then
    Moves = (Req_Tool - Current_Tool) * Ang_Move
    End If
    If Req_Tool < Current_Tool Then
    Moves = (Num_Tools - Current_Tool + Req_Tool) * Ang_Move
    End If
    End If

    'move to safe position
    Code "G0 G53 X-.25 Z-.25"
    Code "G04 P0.5"
    'index turret
    Code "G91 G94"
    Code "G01 A" & Moves + 10 & "F" & CW_Feed
    Code "G01 A-" & Lock_Move & "F" & CCW_Feed
    While IsMoving()
    Sleep(10)
    Wend

    SetCurrentTool Req_Tool
    SetUserDRO 1500 , Req_tool
    Code "G90"
    Code "F" & Current_Feed




    it's a tight fit inside, but it seems to be working. Haven't made any chips with it yet, but soon!
    HF 8x14 linear rail conversion....and maybe more...-20200503_170632-jpg

    and also these:
    https://drive.google.com/open?id=1Vo...o8xroSk8eu0wPI
    https://drive.google.com/open?id=1Vq...Z3UaEGtIR9u066

    Attached Thumbnails Attached Thumbnails HF 8x14 linear rail conversion....and maybe more...-20200503_170632-jpg  


  8. #68
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    Default Re: HF 8x14 linear rail conversion....and maybe more...

    Very nice! Can't wait to see it cutting steel.



  9. #69
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    Default Re: HF 8x14 linear rail conversion....and maybe more...

    That looks great!



  10. #70
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    Default Re: HF 8x14 linear rail conversion....and maybe more...

    So this happened today...
    HF 8x14 linear rail conversion....and maybe more...-20200522_164915-jpg

    The surface finish looks much better in person, and once I get coolant it should look even better.

    but all in all the tool changer is working. the macro seems to be working well. I need to make more clamps but other than that I think she's about done....videos to come soon...

    Attached Thumbnails Attached Thumbnails HF 8x14 linear rail conversion....and maybe more...-20200522_164915-jpg  


  11. #71
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    Default Re: HF 8x14 linear rail conversion....and maybe more...

    and steel too!
    HF 8x14 linear rail conversion....and maybe more...-20200522_213215-jpg

    had some missed steps during some rapid moves so the long "ramp" didn't get touched during the finish pass...time to re-tune the motor settings! Otherwise she cut great, and i think i can push it a lot harder.

    Attached Thumbnails Attached Thumbnails HF 8x14 linear rail conversion....and maybe more...-20200522_213215-jpg  


  12. #72
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    Default Re: HF 8x14 linear rail conversion....and maybe more...

    Looking good! Glads to see you pushing it with steel.



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HF 8x14 linear rail conversion....and maybe more...

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HF 8x14 linear rail conversion....and maybe more...