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Thread: slightly different idea for bearings as slides

  1. #13
    Moderator mvaughn's Avatar
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    Quote Originally Posted by tekno
    was doing a search and found this tread.. would like to see more but we have a link error. can someone help me out?
    Try this link

    Another First Router



  2. #14
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    what flavor roller blade bearings ? ? ?

    CNC-sters -

    in my googling of roller blade bearing sets, i ran across quite a range of them, from a dollar or so a piece, to sets of 4 or 8 for 30-40-50 bucks... (to be used for john conrad kleinbauer's 7th sojourn design (modified)...)

    being a rank newbie, i don't know if the cheapest (roughest?) set of bearings is just as good as the most expensive ABEC 7, zirconium oxide super duper bearings, *for the purposes* of a hobby cnc machine intended to machine wood...

    i wouldn't mind splurging on the more expensive and/or 'ceramic' bearings, *if* i thought they would make a significant difference for my application...

    opinions regarding the level of quality needed would be appreciated...

    thanks, charley
    charleyy@alltel.net

    eof



  3. #15
    Hi there, great idea with the 3 bearing design. I've been thinking about a 3 bearing roller setup myself but you beat me to it! Hopefully you've saved me some work

    My question here is what are people using as slides with the roller bearing design? I am building a setup that is 850mm long. I've been thinking of using stainless tube that you buy from the hardware store for hanging your towels on in the bathroom. These should be very smooth and straight, and pretty cheap. The only thing I wonder about is if it is rigid enough. It would need to be able to withstand a reasonable amount of force to prevent error. Especially in the middle of its run.

    Another possibility is that to increase the rigiditiy you could insert some thick threaded rod inside the tube if it was the correct fit with a bolt on either end.

    Is this a stupid idea? Am I on the wrong track? Give me your thoughts!

    Paul



  4. #16
    Community Moderator ger21's Avatar
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    Quote Originally Posted by charleyy
    CNC-sters -

    in my googling of roller blade bearing sets, i ran across quite a range of them, from a dollar or so a piece, to sets of 4 or 8 for 30-40-50 bucks... (to be used for john conrad kleinbauer's 7th sojourn design (modified)...)

    being a rank newbie, i don't know if the cheapest (roughest?) set of bearings is just as good as the most expensive ABEC 7, zirconium oxide super duper bearings, *for the purposes* of a hobby cnc machine intended to machine wood...

    i wouldn't mind splurging on the more expensive and/or 'ceramic' bearings, *if* i thought they would make a significant difference for my application...

    opinions regarding the level of quality needed would be appreciated...

    thanks, charley
    charleyy@alltel.net

    eof
    You can get ABEC 7 bearings on Ebay for very reasonable prices. Don't buy any until you check there.

    Gerry

    Mach3 2010 Screenset
    http://home.comcast.net/~cncwoodworker/2010.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  5. #17
    Registered jeffs555's Avatar
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    Paul,
    Putting a threaded rod in the center of a tube won't increase the rigidity much. If the tube isn't rigid enough, then going up in diameter will be more effective than using a solid rod. For example, a steel tube of 1-1/8" diameter with 1/8"walls is more rigid than a 1" diameter solid steel rod. Here is an easy to use freeware program that will calculate the deflection given the rod size and load.
    http://www.pcworlddownload.com/busin...nt/BeamBoy.htm


    Jeff



  6. #18
    Quote Originally Posted by jeffs555
    Paul,
    Putting a threaded rod in the center of a tube won't increase the rigidity much. If the tube isn't rigid enough, then going up in diameter will be more effective than using a solid rod. For example, a steel tube of 1-1/8" diameter with 1/8"walls is more rigid than a 1" diameter solid steel rod. Here is an easy to use freeware program that will calculate the deflection given the rod size and load.
    http://www.pcworlddownload.com/busin...nt/BeamBoy.htm


    Jeff
    That's great information Jeff! Thanks for the response. I'll try the software.



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    Quote Originally Posted by gtrdude
    ...the 3 bearing design. I've been thinking about a 3 bearing roller setup myself ....
    ... what are people using as slides with the roller bearing design? .... I've been thinking of using stainless tube that you buy from the hardware store .... should be very smooth and straight, and pretty cheap. The only thing I wonder about is if it is rigid enough. ..... Especially in the middle of its run.

    Give me your thoughts!

    Paul
    Regarding cheap track and bearings:
    Here is another version of a bearing set that I made; this time out of aluminum so no welding is required. Their tension is easily adjustable and they're durable. Also they are open on the bottom which allows for the pipe track to be supported. Details have been posted in other threads and are also on my website...
    The pipe support is a piece of channel; the pipe is bolted through the channel to the primary support. Seems to work well enough; especially considering the price....

    Attached Thumbnails Attached Thumbnails -pipechannel-jpg  


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