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Type: Posts; User: Bryan Turner

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  1. Replies
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    Re: Free HSM Feeds & Speeds Calculator

    GLCarlson,

    Basically just save the webpage to disk (right click on the link and "save link as..."). I wrote more detailed instructions in my last thread about this calculator (here).

    On my...
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    1,575

    Free HSM Feeds & Speeds Calculator

    I've uploaded the (long-overdue) HSM version of my feeds and speeds calculator. It is free and can be downloaded for offline use. Works on most browsers, including your phone! This version adds...
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    3,980

    Re: Steel Feeds and Speeds

    Here's a setup for your Tormach 1100 speeds and feeds in steel (with the SFM recommendations by nutzilla above):
    Speeds and Feeds

    RPM 2670, IPM 20, DOC 0.4, WOC 0.15 -> MRR 1.18, Chipload 0.0017,...
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    2,485

    Re: Material removal, pondering

    IMT - Thanks! Glad it is helpful, I've been using it almost exclusively for a couple years.

    I'm quoting numbers from a different version of the calculator, it's got new equations for HSM. Since...
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    2,603

    Re: G59 P?????

    I probe the top of the upper-left corner of my CarveSmart master jaw - its on the 5" Tormach vise, so the upper left corner pokes out of the vise making it easy to probe all axis. This is my "zero"...
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    Re: Material removal, pondering

    For a slot that wide, just use an HSM/adaptive roughing path with a smaller cutter.

    1/4" 4fl carbide (short flute: 1/2" LOC), 3600 RPM, 80 IPM, 0.012 WOC, 0.4 DOC (230 SFM, 0.0013 chip)

    Should...
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    Re: Ultra basic Speeds and Feeds question

    Roughly speaking, use the shortest possible spindle-to-cut distance, the highest chipload the cutter can take, and the lowest SFM you can stand.

    For special cases (materials, geometries, and...
  8. Replies
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    3,091

    Re: Vertical lines in finished part

    Mike,

    What finishing op are you using in SprutCam?
    Did you program an Arc entry for the cut?
    Are the lines at the quarter or cross-quarter points as the part is fixtured to the table? (ie: part...
  9. Re: Inch Pounds Torque Vise and T-Slot Mounting

    Awall,

    I don't think there's a standard, but if you're making the same part over and over you should measure what strength you're clamping to and use the same setting for each part. My parts...
  10. Re: Would really appreciate comments on machine-ability of this part with a Tormach!

    potomac,

    If these brackets are for mounting sensors, and the sensors are very sensitive, you may find that the aluminum will 'relax' a little too far once it has been cut to shape, especially for...
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    Re: MORE PROBLEMS!!! Grrrrrrr....

    Some more things to try:
    - Use the shortest possible parallel cables
    - Use filtered, shielded, and grounded cables (sometimes called 'networked' cables). Even on a 3' cable..
    - Use the shortest...
  12. Replies
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    3,516

    Re: tormach 770 cutting 1018

    Is the rougher a variable flute?
    Is the rougher a corncob or rough/finish geometry?
    What's the stickout on both tools?

    I find most of my chatter issues are related to workholding or stickout...
  13. Replies
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    3,932

    Re: Vibratory Tumbler Suggestions

    I have two:

    HF dual-drum rotary tumbler
    - Small parts (2" long 1" diam), about 4 pieces per drum
    - Green triangles
    - 2-3 hours for a nice even sanded finish
    - Very quiet; just below...
  14. Re: Hissing retract air bleed on power drawbar

    Mine does too.

    Last year I took it apart and re-seated the o-rings, cleaned and taped the threads, etc. Stopped for about a year, but it's back again.

    I'll try oiling the cylinders as a quick...
  15. Replies
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    3,516

    Re: tormach 770 cutting 1018

    I have a 770 also, for hard materials I would suggest 1/4" 4fl carbide endmill.

    I've not tested these, but they look about right. Reduce DOC if you bog down.

    1/4" 4fl Carbide, 3970 RPM, 13...
  16. Replies
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    Re: Mounting Carvesmart jaws on 5" CNC vise?

    I've got a set arriving Monday.. guess I'll get an order in with McMaster now so I can use them when they land..

    This will annoy me too if the bolts are wrong!

    Looks like you're right 7/16-14 ...
  17. Replies
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    951

    Re: Sprutcam 4th Axis Rotating Fixtures

    - What version of SprutCAM?
    - Which machine model version are you using?
    - Is the tailstock part of your "workpiece" or is it placed in the "fixtures" section? (I've not used the tailstock in...
  18. Replies
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    8,639

    Re: Adjustments for accuracy?

    CountrySmith,

    Thanks indeed! You're right, I was working from the original manual. Just downloaded the new manual and it has the sides reversed. Well, at least that's the easy gib to get to!
    ...
  19. Replies
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    8,639

    Re: Adjustments for accuracy?

    Hey folks, sorry for the absence!

    I'm not sure I did any favors to my machine by adjusting the X & Y axis gibs...

    X-Axis: Backlash 0.0005", no change from previous.
    ---------------
    So this...
  20. Replies
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    8,639

    Re: Adjustments for accuracy?

    > How does approximately 200# (in-lb? ft-lb?) at the stepper relate to force at the cutter...?

    I was referring to the force driving the table into the cutter (lbs), a portion of which deflects the...
  21. Replies
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    8,639

    Re: Adjustments for accuracy?

    > A spring pass just handles the symptoms without correcting the underlying issue

    Definitely want to correct the issue!

    > 0.002 per side .. maybe 1/4" apart .. indicate that something is...
  22. Replies
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    8,639

    Re: Adjustments for accuracy?

    Thanks all, good comments. Looks like the Z-axis gib was the right diagnosis.

    When I went to adjust the gib, I loosened the upper retainer 8 turns, but the lower retainer would only tighten 3...
  23. Replies
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    8,639

    Re: Adjustments for accuracy?

    > You could also mill a rectangular pocket and check the dimensions that way

    Yes, the first test pieces had pockets too small and outer profile too large. I decided to start with fixing the outer...
  24. Replies
    38
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    8,639

    Adjustments for accuracy?

    So I have a job coming up with high(er) accuracy than usual (needs +/- 0.001). I made some test pieces and they were all off by about 3-5 thou in various dimensions. Decided to go back to basics to...
  25. Re: Faceted surface finish with Fusion 360 on 770

    Definitely not an issue with the Tormach. Here's a piece I made last night with no faceting, the marks you see are from the ball-mill cutter. I used Adobe Illustrator -> Creo -> SprutCAM for this...
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    Re: First attempt at engraving

    Horrible cellphone photo, but this was on the machine earlier today. 0.004 feature size, 0.02 deep using a 15-degree engraving bit in 14k rose gold for a wedding band. A quick brush on the rubber...
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    Re: First attempt at engraving

    I do a lot of complex micro-engraving (0.002-0.004 tip engravers). I've had good results on gold, silver, copper, and aluminum.

    Here are some general guidelines for micro-engraving:
    - Use the...
  28. Replies
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    Re: New FREE Feeds & Speeds Calculator

    Thanks for all the great feedback and PMs! I got some time to fix the big bugs on the punch list and just uploaded a new version.

    Optimizing Feeds and Speeds Calculator for Milling

    Changes:
    -...
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    Re: Longest Endmill on PC1100

    Hirudin - thanks for the plug! ;-) Reminds me I need to upload the version with stable-search (so links like that always show the same result).

    As for long endmills, I don't see any reason not...
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    Re: New FREE Feeds & Speeds Calculator

    Hirudin,

    I added Metric conversion to the calculator. Have not tested it much, but the numbers "look right". Let me know if you run into any problems.

    Specifically, it will convert the number...
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