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Thread: Thoughts on buy a used Colombo spindle of unknown history?

  1. #73
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    Default Re: Thoughts on buy a used Colombo spindle of unknown history?

    Here's an example of one I use, 3/8" shank, 3/4" cut width...

    https://www.deepgroove1.com/blank-rw...exable-endmill

    The inserts are pretty good, though you can buy surplus PCD inserts relatively cheap on eBay, which would leave a superior finish...



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    Default Re: Thoughts on buy a used Colombo spindle of unknown history?

    Quote Originally Posted by ger21 View Post
    He's talking about insert tooling, similar to these.
    https://www.tormach.com/store/index....roidal_Cutters
    Again, negative rake probably not best choice for electric spindle, since the cutting forces are a lot higher...



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    Default Re: Thoughts on buy a used Colombo spindle of unknown history?

    Quote Originally Posted by louieatienza View Post
    There's aa lot of sizes of collets you can use with the ER collet so as long as you can find a tool with a straiggt shank that fits a collet, you're fine. The one I have is 3/4" cut width with 3/8" shank. And no, you'd have to buy specifically an ATC spindle. You could get an ISO30 ATC spindle and run it with a brushless motor and drive.
    I have seen a few aftermarket ATC set-ups designed for use on cheaper collet spindles, including one for a cheap Dewalt router but the costs are so ridiculous that I can't imagine that anyone has ever purchased one. The ATC add-on I saw for a $300 Dewalt router was over $2,000 plus an additional $1,000 just for the carousel (which only held 6 toolholders). It ranked among the worst value products I have ever seen considering Chinese 9kw ATC spindles start at $1800 on eBay.

    I was wondering if people ever used their ER collet spindles with pullys to drive belt spindles (through a gear reduction) to add a temporary low speed / high torque milling capability. Cheap BT30, BT40 and R8 mechanical seem readily available and ATC for mechanical spindles starts at $1,000 on eBay. Motorized drawbar quick change for R8 spindles are just $130.



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    Default Re: Thoughts on buy a used Colombo spindle of unknown history?

    Quote Originally Posted by louieatienza View Post
    I think the Tormach TTS has 1/2" shank. However, I probably wouldn't use them on an electric spindle with a 1/2" collet, since they're probably not balanced for the higher speeds, and heavier, which would wear your bearings out fast.
    TTS is 3/4" shank.

    Quote Originally Posted by Goemon View Post
    I have seen a few aftermarket ATC set-ups designed for use on cheaper collet spindles, including one for a cheap Dewalt router but the costs are so ridiculous that I can't imagine that anyone has ever purchased one. The ATC add-on I saw for a $300 Dewalt router was over $2,000 plus an additional $1,000 just for the carousel (which only held 6 toolholders). It ranked among the worst value products I have ever seen considering Chinese 9kw ATC spindles start at $1800 on eBay.

    I was wondering if people ever used their ER collet spindles with pullys to drive belt spindles (through a gear reduction) to add a temporary low speed / high torque milling capability. Cheap BT30, BT40 and R8 mechanical seem readily available and ATC for mechanical spindles starts at $1,000 on eBay. Motorized drawbar quick change for R8 spindles are just $130.
    I've seen aftermarket ATC systems for under $1000 (not including carousel,) but quite a few compromises and uncertanties, and still getting near a chinese ATC spindle price.



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    Default Re: Thoughts on buy a used Colombo spindle of unknown history?

    Quote Originally Posted by louieatienza View Post
    Again, negative rake probably not best choice for electric spindle, since the cutting forces are a lot higher...
    I said "similar" to these. That was the first link I came across, and was quickest to post.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

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


  6. #78
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    Default Re: Thoughts on buy a used Colombo spindle of unknown history?

    It ranked among the worst value products I have ever seen considering Chinese 9kw ATC spindles start at $1800 on eBay.
    I see some 1.8Kw ATC spindles for $1800, but the 9KW seem to run between $3000-$4000. Even most of the 3KW are in the $3000 range.
    And you really don't know what you are getting with any of these. Bottom line, is that ATC spindle are expensive.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

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


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    Default Re: Thoughts on buy a used Colombo spindle of unknown history?

    I thought about trying one of these to get a "cheaper" atc system on a cnc router, but being limited to er16 just didn't cut it (ha ha)

    https://www.sorotec.de/shop/Tool-cha...ml?language=en



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    Default Re: Thoughts on buy a used Colombo spindle of unknown history?

    Really, if time is truly not of an issue, then why even bother with ATC? It's not like you're going into full scale production making these molds. If you go about using your spindle to power an ATC spindle cartridge - keep in mind by the time you procure a pulley and shaft for the Colombo spindle (and have that assembly balanced if you want to spin it at 18krpm), get an air cylinder, fabricate a "floating plate" unit so your air cylinder isn't mashing your spindle bearings every time you make a tool change, fabricate your Z axis plate to hold all this, including the fact that you'll either have the ATC spindle far away from the gantry or have the Colombo spindle mounted to the side of the Z carriage to accommodate the belt... it gets pretty kludge. You're better off getting one of these...

    https://ugracnc.com/store/cnc-spindl...v-iso30-detail



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    Default Re: Thoughts on buy a used Colombo spindle of unknown history?

    Is the stuff from Ugra any better than the run of the mill Chinese stuff that it's 50-100% more expensive than?



  10. #82
    Community Moderator ger21's Avatar
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    Default Re: Thoughts on buy a used Colombo spindle of unknown history?

    I would guess that the UGRA spindles are at the upper end quality wise of the chinese spindles. What your paying for is the fact that he actually tests them for runout, and provides an actual warranty.
    But in many cases, the price is nearly 3x higher, and the warranty is only 1 year. But if the pictures are an indication of the quality, they certainly look 3x better than the spindles on Ebay.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

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


  11. #83
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    Default Re: Thoughts on buy a used Colombo spindle of unknown history?

    Yes Gerry you are right.

    Our spindles are in the upper end. They are still Chinese spindles tho.

    You realize the difference when you actually hold in hands a GMT or KEN spindle and the cheap one you can find on eBay.

    When I was looking for a spindle suppler when we started our business I got a few samples from different Chinese factories.

    Most of them were never listed for sale. They had so poor quality that I was not brave enough to introduce them to the market under our name.

    What about GMT? I love them so I think you customers will love them. That's it.

    Out of thousands sold spindles only 5-7 pieces were bad. And most of them were caught while performing the tests.

    I would easily give a 2 or 3 year warranty even though the factory gives only one year.

    The thing is the customers kill spindles sometimes It takes a lot of energy to solve such customer's problems

    And sure our prices are quite high.

    I think we will try to get some cheap spindles to give our customers more options but most likely we will never drop prices for GMT or KEN.

    Regards,

    Andy

    http://UgraCNC.com


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    Quote Originally Posted by skrubol View Post
    Is the stuff from Ugra any better than the run of the mill Chinese stuff that it's 50-100% more expensive than?
    Dunno... just Google search....



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Thoughts on buy a used Colombo spindle of unknown history?
Thoughts on buy a used Colombo spindle of unknown history?