Originally Posted by slashmaster  Just what stats did Probotix inflate? You're saying the 400 oz in steppers are not actually 400 oz in? Do you have a link to the cnc fusion kit # 6 you're thinking about? I only see 1-5, are you talking about the deluxe kit that cost $949? You're spending almost 1k and still don't have stepper motors or any electronics for it. You sure it's worth it? |
I was not necessarily saying the Probotix inflated any of their stats, that was just reasoning behind the choice for Gecko. That post was not meant to knock Probotix, as I have seen their Fireball in action and it seems perfect for what it was built for. THey are a good choice, but not for this build. However, their website does say the "green monster" steppers are rated at 3A while the kit only provides drivers with a max of 2.5A. So I do not see the 400 oz/in steppers being able to provide that much in the kit they made.
Sorry for the confusion, yes the #6 kit is the Deluxe kit. I was going off of memory and I just assumed since they had a 1-5, and the deluxe is still a kit, it would be the 6th. The price is what I am trying to balance now. The inherit properties of ballscrews might allow me to reduce the power needed to drive the axis so I can cut costs other places. I am still uncomfortable making that purchase quite yet. In the 5th post near the end I try to compare costs between getting the ballscrews and cutting corners other places. In the best conditions for purchasing the mill (which I still have not) it would only be roughly a $300 increase to get the deluxe kit as opposed to keeping stock leadscrews and the G203v's. So in short, I do not know if it is worth it yet, but I am leaning towards yes.
Originally Posted by cyclestart Keeping the acme on the z would provide a lot of mechanical advantage over a ballscrew. Another option to consider. There is a speed penalty.
S J H builds beautiful machines. Pity some of the photos are missing in this thread
http://www.cnczone.com/forums/showthread.php?t=24983 |
What kind of mechanical advantage are you talking about in regards to keeping the z-axis Acme screw? In the acrticle you linked to
S J H says his IPMs are 55 less on the z-axis, and backlash is 4 - 6.7 times as much also. It would be an interesting thought if I knew the advantage.
Matt McColley: My planning is so far matching your build log to the T! I have not seen it before, but it interests me greatly. With how helpful the CNCFusion guys are they might even go for a switch on the pully ratio in the kit