. .
Page 6 of 6 FirstFirst ... 456
  1. #51
    Quote Originally Posted by Chaz View Post
    For info, I currently run a 6.8 KW HSD Spindle on my Concrete mill. If you look up my build thread (search for Thor), you will find it. I started with a 4KW Chinese spindle which worked OK. Low / no torque and ER collets, found a 2nd hand HSD spindle and not looked back.
    The problem with hobby CNC machines using full sized spindles is weight. For example the reason most router based CNCs use router is because of weight either bogging the gantry down or causing the Z-axis to fall (like the Shapeoko, Ox etc). I think the Shapeoko actually used a SPRING at one time to help keep the router from dropping and not being able to get back up again. So a proper spindle is out of the question.

    New builders also donít take into account the weight of water in water cooled machines which is why itís better to use an air cooled one on a smaller hobby machine. Plus water is another thing I would want to keep away from wood. I got some lubricant on my waste board the one time and it had to be replaced because it swelled up over night.

    I think everyone I know of (bar one who went water cooled and had to go double belt and larger stepper motors before it would stop bogging down) has gone the air cooled spindle route. But if I could afford all metal underside and stronger steppers or drives there would be no question. In that case it would be water cooled all the way.

    At the end of the day it all comes down to cost.
    Last edited by NeoMorph; 9 Hours Ago at 12:20 AM.

  2. #52
    New builders also donít take into account the weight of water in water cooled machines which is why itís better to use an air cooled one on a smaller hobby machine. Plus water is another thing I would want to keep away from wood. I got some lubricant on my waste board the one time and it had to be replaced because it swelled up over night.
    I take it you use an air cooled radiator in your lounge then so it does not ruin the carpet
    ..Clive
    The more you know, The better you know, How little you know

  3. #53
    Kitwn's Avatar
    Lives in Exmouth, Australia. Last Activity: 3 Hours Ago Has been a member for 2-3 years. Has a total post count of 241. Received thanks 30 times, giving thanks to others 4 times.
    I use the popular 2.2KW water cooled spindle moved by a 1610 ballscrew which does fall slowly under it's own weight when the stepper motor power is removed. Part of my SOP is to put a prop under the Z axis before powering down the control box and removing it again after power is back on. It's not really a problem and I would expect to re-home after an e-stop anyway. No water leaks so far either.
    Engineering is the art of doing for ten shillings what any fool can do for a pound.
    Wellington.

  4. #54
    Oops... double post.
    Last edited by NeoMorph; 2 Hours Ago at 07:13 AM.

  5. #55
    Quote Originally Posted by Clive S View Post
    I take it you use an air cooled radiator in your lounge then so it does not ruin the carpet
    Funny you should say that. A radiator leaked all over my hall about a month ago. Had to throw out the carpet.

    Seriously though... itís the same with water cooled PCs. Itís freaking great when it works but in a CNC it has to deal with the carriage moving back and forth. If you have an all metal CNC you donít worry if you get a leak. You fix the problem and wipe up the spill. With a wood base CNC itís going to swell the wood and we all know how itís going to affect accuracy after that. It means replacing the spoilboard, having to resurface etc. Itís faff you can do without if you use air cooled spindles.

    But like I said... if I ever build a metal based one Iím going for an auto-change water cooled, pneumatic drawbar spindle... they kick ass (watch Marco Reps on YouTube).

    Edit: Regarding my worry about leaks... Iím slightly OCD about things going wrong after year 1 where pretty much everything did go wrong. The controller was going beserk every so often, the axes would randomly stop working, I had to keep uploading grbl because it was getting corrupted. Drove me nuts.

    Took ages to track down... the cause was a link of LED strip lighting that was in my enclosure. It was only after reaching into the CNC the one time that I notice the lights were pulsing randomly in one corner. I thought to test it with another of my 12v psu blocks and hooked it up... and killed ALL the lights in my enclosure. Turned out I used a 24v one instead of a 12v and caused the lights to come on, do some freaky stuff before flaring any dying.

    But ironically killing those lights fixed my CNC... itís run smooth as silk since. I did have to buy some more lights but itís running fine so itís money well spent.

    So yeah... I tend to still worry a lot.
    Last edited by NeoMorph; 2 Hours Ago at 07:29 AM.

Page 6 of 6 FirstFirst ... 456

Thread Information

Users Browsing this Thread

There are currently 3 users browsing this thread. (0 members and 3 guests)

Similar Threads

  1. Academic research on CAM CAD software/ Help please
    By lorenzo0572 in forum CAD & CAM Software
    Replies: 3
    Last Post: 03-05-2014, 11:08 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •