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Type: Posts; User: Muzzer

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  1. Replies
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    Re: Fuji IGBT equivalent

    It's unusual for an IGBT module to pop without damaging its gate driver circuit(s). Are you convinced the IGBT module is the extent of the damage? How did it fail?
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    Re: ball screws for bridgeport mill

    "No - I agree with you, The springiness is in the yoke" ??
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    Re: ball screws for bridgeport mill

    You can use Chinese ballscrews DFU2505 (so called zero backlash double ballnut) for X and Y. If you do some homework first, the supplier will usually machine the ends to your drawing for a nominal...
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    Re: Shizuoka AN-S mill information

    If you look at the 5th post in this thread you will find a link to the parts list, which is the closest thing you will get to a user manual for this machine. I have the actual user manual but it...
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    Re: Shizuoka AN-S data dump and gib question

    Hi Josh - thanks for posting your manual. The Yeltrow manual was actually mine and it's actually a pretty faithful image of what I have. The fact is that my manual is in a pretty poor state, so I've...
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    Re: DC Servo for Mach3 spindle

    Be aware that most rigid tapping setups require an encoder that is 1:1 geared to the spindle and has an index pulse. For many machines that can be a problem.

    It still seems to be on trend to try...
  7. Re: New HXX GCS903-2 axis 3-axis data display table

    What a fantastic range of products and discounts. Pity they are all showing as "unavailable".
  8. Re: Is there any decent alternatives to Fusion 360 for small business / hobby use?

    I finally got over the irritation of the changes to Fusion and swallowed the subscription which isn't actually very expensive. This gives you your rapids back and also gives you 4th axis operation,...
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    Re: Lower spindle rpm when feed rate decreases

    Well Fusion and most modern HSM toolpaths manage it - by changing the feedrate and the width of cut. It's called "adaptive". They don't change the spindle speed.

    Keep working at it and perhaps...
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    Re: Lower spindle rpm when feed rate decreases

    I think you've misunderstood how modern adaptive toolpaths work, such as the ones in Fusion. Consequently, I suspect you are overthinking this. They change the feedrate as they change direction in...
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    Re: Shizuoka AN-S mill information

    Have a look at my blog where I converted my Shizuoka AN-SB to Centroid Acorn. www.murraye.com

    You could message me there presumably.

    Also I have a Youtube channel. No word, just action....
  12. Re: Boss 8 CNC retrofit and 5 HP upgrade - Build thread

    I'm guessing this will be a pretty wide enclosure. If you have a long table and a decent range of movement, you'd be able to climb inside and sleep in there. I had a similar concern on my Shizuoka...
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    Re: Pathpilot Backlash Compensation

    Can't wait to see what Cliff comes up with next but he will have thought about it very carefully and he comes at this with decades of experience....
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    Re: Pathpilot Backlash Compensation

    Yes, as I replied to your video, I agree with Step that backlash compensation is likely to worsen backlash in many situations. There are lots of myths and misunderstandings about the perceived...
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    Re: 230v servo on 120v ?

    I've spent several decades developing PSUs and VFDs and we always designed for 240 +10% ie 264V. The +10% is required (by UL, CSA etc) on top of the declared sticker voltage. And you wouldn't expect...
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    Re: knee mill to cnc converstion

    You may hear different experiences and suggestions and none are right or wrong. Neither of my two knee mills have handles. The Bridgeport conversion originally did but I removed them to improve the...
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    Re: Driving a VFD with another VFD?

    Well, I suspect he was confused by your post #22.

    As long as you correctly program the motor nameplate values for the voltage, current and frequency, it will set the correct V/f, max phase current...
  18. Re: Spindle motors: rpm / voltage / power / current

    My Hitachi spindle motor is also designed for use with a VFD. The base speed is 1760rpm at 60Hz and 190Vrms but I have set the max speed at 7000rpm (was originally 6000 but hey). It can't produce as...
  19. Re: Spindle motors: rpm / voltage / power / current

    It's most likely that the main ratings are at the "base speed" which is almost certainly 1500rpm here. Above that, the torque (and current) will tail off, as you won't have enough voltage to maintain...
  20. Re: Thinking about designing a 5 axis machine, what about an AB head?

    Unless I misunderstood, could you not do this by mounting a large rotary table on the machine table and then mounting a normal 4th axis on that? I guess that would be a "CA" concept in your...
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    Re: Computer Noise??

    I don't have a 3-ph inductor on my VFD, never used one, nor shielded motor cables inside the cabinet. I use screened cables for the IO to the controller (encoders, limit switches etc) and a Schaffner...
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    Re: DMM servo set up

    I've got a couple of these old DYN2s on my Bridgeport X and Y axes. As you've suggested, the adaptor shown in the first photo is for a std RS232 port, which is still supported by the current...
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    Re: Computer Noise??

    The VFD doesn't have an input filter either. You should always fit the recommended RFI filter on the ac input. Without that, there will be horrendous high frequency noise flying around the whole ac...
  24. Re: Convert manual Bernardo KF 20 L Super milling ma to CNC, but keep manual mode opt

    It looks like a fairly common Chinese machine with a "Bernardo" badge on it. I don't have one myself so don't know the model names but if you Google you should find a lot of conversions for this same...
  25. Re: Yaskawa servo motor "retrofit" (Hurco BMC-30)

    If it's got Yaskawa servo motors, doesn't it also have Yaskawa servo drives? If so, I can't imagine why you'd remove them and fit something in their place. Yaskawa is about as good as you'll get when...
  26. Thread: Software

    by Muzzer
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    2,388

    Re: Software

    Designspark is basically a cut down version of Spaceclaim, IIRC. It seems there used to be a SC forum on this site but it doesn't seem to have flourished....
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    Re: Fusion 360/Mach 3 Gcode program end code help

    If you feel up to it, you can always have a go at modifying your post process to change the code at the start and finish of the file to whatever you like. It's written in Javascript, if you have any...
  28. Thread: CNC Tube Bender

    by Muzzer
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    Re: CNC Tube Bender

    You should make sure that you are sitting down when you receive the quote for a harmonic drive of the correct size. However, you can buy pre-owned examples from ebay dealers in South Korea and China....
  29. Re: Lost position with closed loop stepper motors! Nightmare! Please help!

    Ah - there had to be an obvious explanation! However, the max axis speed and the pulse frequency are two different parameters. If you had the pulse frequency set to 400kHz, the pulse width would be...
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    Re: Tension Compression tapping help

    I've been using a TC head on my machine to do tapping and the reason I see to include a delay at the hole bottom is to allow the VFD to stop and change direction without tripping - and avoid the...
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