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Type: Posts; User: j3dprints

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  1. Replies
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    Re: BT/NT30 Spindle for 12Z Mill?

    Hi guys,

    Can anyone give me any sort of contact at all as to where I can buy a replacement spindle?
    I am in Australia which means little to no spindle availability other than overseas. I was...
  2. Flow control valves in Australia for 1 shot oiler? And other fittings?

    Hi all anyone know a supplier in Australia for small oil control valves and other stuff like manifolds that would suit a 1 shot oiler project? Looking to make one for my cnc benchtop machine...
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    Ball screw nut - grease or oil?

    I am doing a cnc conversion on a bench mill (rf-45). Should I hook my ball screw nuts up to an automatic oiler system (which will oil my ways too) or a grease system? They have a small hole on the...
  4. Is a 400w servo adequate for RF-45 Z-axis?

    Hi pretty much as subject says, is a 400w servo adequate for RF-45 Z-axis? I am picking up some older DMM 400w servos (60EM-DHT-36) and I'm wondering if they'll move it up and down if I counter...
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    Re: Mini mill conversion Input apreciated

    Allright I read an answer on youtube about that once from this guy - https://www.youtube.com/watch?v=k2F6100RKOE - simpsons36. Looks like he really knows his s#$t from that conversion and his opinion...
  6. Electrical setup for mains voltage single phase servos ?

    I am trying to test my servos and I have the following wiring diagram from the manual which says to put in a contactor with surge suppression and breakers for each servo.
    1) Is this necessary? I...
  7. Replies
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    Re: Chinese ac servo from Fast to Buy

    I bought a few 6 months ago from aliexpress (check them, they may be cheaper for you - just search for 750w servo) but I havent gotten around to installing them yet. The high voltage aspect is...
  8. Re: Minimum timing pulley/sprocket size for a servo?

    Thanks, I will do that then.

    One more question - I was thinking of ordering the ballscrews with machining to support a little bit more coupling room to attach a manual handle. The handle may have...
  9. Re: Minimum timing pulley/sprocket size for a servo?

    I think I am going to use GT 5mm pitch, 9mm wide, does this seem too small? Do I base it on instantaneous or maximum HP or the rated HP? Since the 750w servos are about 1HP but can operate at 3HP for...
  10. Re: Minimum timing pulley/sprocket size for a servo?

    Thanks guys, I was a bit worried because to go 1:2 on my Z I'd need a 2.2" pulley then a 4.4" for the driven which seems too large. Even 1.5 ratio which I'd like for x and y gives you 3.3" which...
  11. Minimum timing pulley/sprocket size for a servo?

    Hi I am trying to work out how big to make the small pulley that goes on my servo. The smaller I make it the higher the force is on the servo for any given torque.
    The Gates manual has...
  12. Replies
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    Y and Z ballscrew end supports

    Are end supports required on the Y and Z axis of these bench top mills ball screws?
    I've noticed everyone supports the end of the ballscrew on the X but haven't seen shots of any supports on Y or Z....
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    Allowable y-axis overhang?

    I've seen a few people have the mill table of bench top machines move out on the y-axis beyond being flush with the saddle.

    My question is how much is ok? I am trying to size a y axis ballscrew...
  14. Replies
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    243

    Allowable y-axis overhang?

    I've seen a few people have the table move out on the y-axis beyond being flush with the saddle.

    My question is how much is ok? I am trying to size a y axis ballscrew and I need to allow for this,...
  15. Re: Hafco (RF-47) CNC mill and lathe conversions - finished

    Very nice! I am attempting the same thing with my HM-46 in Brisbane.

    I have been busy scraping the dovetails in a disassembled state, they were really out of whack and the mill is almost new. The...
  16. Replies
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    212

    Good basic schematics?

    I am CNC'ing a mill for the first time, and today I did very basic research on what contactors, breakers and EMI filters were. I was just hoping someone could link me to some good basic CNC...
  17. Replies
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    Limit/homing switch questions

    Hi all I am trying to work out which electrical bits I'm going to need for my cabinet, and have hit the problem of limit/homing switches.

    Questions... Is the accuracy of the limit switches really...
  18. Replies
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    Re: PM45 mill upgrades

    Did you square the head to the column before squaring the head to the base?
  19. Replies
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    Re: Skyfire CNC owners?

    I wrote about 5 months ago. I also checked the website a few times. Company seems dying/dead.
  20. Re: Best belts for 750w servos and 1.8kw spindle? Mill retrofit

    Thanks guys,

    I was just running some preliminary numbers for sprocket sizes.
    I looked at the GT2 / GT3 manual and it has a NEMA table that recommends for 1hp (~750w) motors a ~2" sprocket...
  21. Re: Best belts for 750w servos and 1.8kw spindle? Mill retrofit

    Any suggestions as to how to mount one to the servo? The 750w servos have a 20mm bore, and a ~6mm (5.90 measured) width keyway. Total "diameter" of keyway + servo shaft is ~21.9mm.
    I did some...
  22. Re: Best belts for 750w servos and 1.8kw spindle? Mill retrofit

    Thanks fellas, now the million dollar question - what is the GT2 profile I need to cut? Anyone got an image or CAD file?

    I found the BELT profile but I'm guessing the pulley profile is slightly...
  23. Re: Best belts for 750w servos and 1.8kw spindle? Mill retrofit

    Very nice, what cutter did you use for the pulley profiles? I have a dividing head and another mill so I could do that, but it's not cnc so it will be time consuming I guess.
  24. Re: Best belts for 750w servos and 1.8kw spindle? Mill retrofit

    Thanks Roger, but I think I can do it, the RF-45 will be hand scraped before assembly so everything should be pretty schmick. Linux cnc controller, servos, automatic oiler, rails on z axis, etc. I...
  25. Best belts for 750w servos and 1.8kw spindle? Mill retrofit

    Hi guys, is there a 'go to' belt option for servos that provides minimal backlash and is not out of this world expensive? Perhaps what the 'pros' use on some VMCs?
    I have read through some of the...
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