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  1. #661
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    Default Re: THE GRIZZ

    the diary of..... #3



    "THE GRIZZ" photo album - https://goo.gl/photos/yLLp61jooprtYzFK7
    Youtube - https://www.youtube.com/channel/UCT2lq9obzEnlEu-M56ZzT_A


  2. #662
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    Default Re: THE GRIZZ

    The quality of your build is inspiring .. keep posting the updates!

    Gary



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    *Registered User* Abuckeye's Avatar
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    Default THE GRIZZ

    What a great build and write up!
    I started reading tonight from page one and I couldn’t turn away. What a wealth of information from some great craftsmen!


    Sent from my iPhone using Tapatalk



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    Default Re: THE GRIZZ

    Abuckeye & Gary,

    Thank you for the nice comments..we always try to to the best we can.

    I would wager that many members are worn out on this build and are waiting for us to actually put the machine to practical use making things. That will happen for sure but right now we have a chance to 'tinker' and fine tune the things we have already done. This past weekend the external braking resistor was somehow switched ON by the Hitachi frequency drive and almost went up in flames. There was no real damage but we haven't found the culprit for sure..some noise or external voltage spike may have triggered the drive to initiate the braking resistor while the spindle was running. Nick smelled the resistor cooking and actually burned his hand a bit when he touched it.

    The spindle/Belleville washer arrangement works well but it's not proper from a design standpoint. Because we're using around 4000 pounds of drawbar tension, this force is trying to pull the upper and lower bearing cartridges together which results in a very tight turning spindle when warm. I can see a redo on the spindle down the road a bit.

    All the machines in my shop have paid for themselves many times over in projects for customers..I feel the 'Grizz' should do the same and I'm pushing Nick to cut back on the tinkering a bit and to start finding jobs for the machine.

    Thanks for watching this thread and for the positive comments. We'll keep the pictures and posts coming as long as they are welcomed.

    Stuart & Nick
    '

    "THE GRIZZ" photo album - https://goo.gl/photos/yLLp61jooprtYzFK7
    Youtube - https://www.youtube.com/channel/UCT2lq9obzEnlEu-M56ZzT_A


  5. #665
    Registered Kenny Duval's Avatar
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    Default Re: THE GRIZZ

    Well...I can always crate up and send him my BF20 and he test his merit putting linear rails on it.



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    Default Re: THE GRIZZ

    Gents,

    I have not been here lately so I thought I would sneak back in and share a little thing that Nick did on the Grizz a few weeks ago. It was a favor for a friend of mine..a small piece of side rod linkage off of a old Tyco HO gauge steam engine. The material was Starrett O1 tool steel that we ground to .020 and machined with a .030 solid carbide endmill. Nick dimensioned the part and drew it up in Fusion 360 and ran it on the Grizz which uses Mach-4. To be on the safe side I ordered 3 endmills and we ended up breaking 2 halfway through the part. They would break at the same point in the program so I think there was some little hiccup going on. The 3rd one finished the part and it was a dead nuts, exact copy of the sample, and fit the little locomotive perfectly.

    The piece of O1 was crazy glued to a small aluminum plate that was held in the vise. After machining a little torch heat breaks the glue bond and you have your part in hand. I think there is some video of the action and I'll ask Nick to post it.

    I'm sharing this because it blows me away to see a .030 endmill in action..they're pretty darn dinky. That long slot is .040 wide.

    Stuart

    THE GRIZZ-nickstrainlinkage-jpg

    Attached Thumbnails Attached Thumbnails THE GRIZZ-nickstrainlinkage-jpg  
    "THE GRIZZ" photo album - https://goo.gl/photos/yLLp61jooprtYzFK7
    Youtube - https://www.youtube.com/channel/UCT2lq9obzEnlEu-M56ZzT_A


  7. #667
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    Default Re: THE GRIZZ

    I use a 1mm end mill for one of the parts I regularly make. Not a fun tool to use. The quality of small end mills varies even greater than those of larger end mills as far as I can tell.



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    Default Re: THE GRIZZ

    Quote Originally Posted by CL_MotoTech View Post
    I use a 1mm end mill for one of the parts I regularly make. Not a fun tool to use. The quality of small end mills varies even greater than those of larger end mills as far as I can tell.
    I purchased these end mills through Shars but they were made in the USA. They sure looked good under a jewelers loupe..nice crisp flutes and a flat sharp end. I don't think our spindle RPM was more than 4k but the feed and DOC was very conservative. At least that's what Nick tells me..I wouldn't know from Adam..can't even turn the thing ON!

    Stuart

    "THE GRIZZ" photo album - https://goo.gl/photos/yLLp61jooprtYzFK7
    Youtube - https://www.youtube.com/channel/UCT2lq9obzEnlEu-M56ZzT_A


  9. #669
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    Default Re: THE GRIZZ

    I'm reading this with interest as I'm looking to buy one of these with a R8 spindle:
    AMAT30LV MT3 Milling Machine

    Not far off similar to the Grizz. I'll keep it simple to start with using the usual Chinese stuff. Then build on it while it funds itself.
    Big upgrade over my X2 conversion.



  10. #670
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    Default Re: THE GRIZZ

    Quote Originally Posted by atomarc View Post
    I purchased these end mills through Shars but they were made in the USA. They sure looked good under a jewelers loupe..nice crisp flutes and a flat sharp end. I don't think our spindle RPM was more than 4k but the feed and DOC was very conservative. At least that's what Nick tells me..I wouldn't know from Adam..can't even turn the thing ON!

    Stuart
    As I'm sure you know when you get that small in cutter diameter, tool holder/ spindle runnout is a big issue. If you didn't check it before making chips that could have contributed to early failure.



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    Default Re: THE GRIZZ

    .



  12. #672
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    Default Re: THE GRIZZ

    Quote Originally Posted by CS900 View Post
    As I'm sure you know when you get that small in cutter diameter, tool holder/ spindle runnout is a big issue. If you didn't check it before making chips that could have contributed to early failure.
    I've only got a X2 conversion atm that can't handle much.
    When I first started chipping my cutters weren't lasting (6mm / 1/4in)
    Using ER32 chuck, feed of 200mm/min, rpm of 1000, doc 0.5mm.

    Now for that size cutter I'm using direct collets giving runouts of around 0.007mm, feed of 800mm/min, rpm of 1300, doc average of 0.96mm.
    They're lasting much much longer but I need a better machine to go any further with feed and doc.
    8mm cutters can only go 650mm/min without severe chatter.

    I've put together a really good coolant system I now need a decent machine



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