Re: [CAD_CAM_EDM_DRO] Re: Screw Size----Stepper Size?

brecoflex makes one heck of a nice polyuretane belt, I have several here
that I've been playing with and you can get quite a bit of
tension on them, one problem with cutting foam is that there will be
dust everywhere, I am willing to bet that 2 11 foot leadscrews and
bellows would eat up a good chunk of your budget. where are you located,
as I'm sure there are several people on this list that are reasonably
close to you, would allow you to see first hand and decide for yourself.
I have a 8'x12' router, gantry weighs over 1000lbs, running 820 watt AC
servos, with a rack and pinion drive, acceleration and rapids can be
really scary, the machine rapids at 600 ipm, and I've run it at 1000
ipm, but it really starts getting into structural issues on accels and
decel... Next step is to remove the rack and replace it with the timing
belts. Ideally, motion should be quieter and repeatability and total
accuracy "should" increase quite a bit. I know of several commercial
router builders that are or have used breco timing belts, 1" wide or
wider that have similar performance. Realize these aren't normal rubber
belts, but pretty hard plastic type with steel wires. They work, and
installed tooth down, are fairly immune to dust and crud. Just my $.02


erie

surfbuilder2003 wrote:

>Hello erie,
>
>$10,000 is about our budget, give or take. Precision does not have to
>be right on. They will have to be finish sanded once it comes of the
>cnc table. I heard that timing belts will slow down the process. I am
>a little concerned with time and speed. Someone told me to support
>the screw on both ends and something else to help reduce inertia so
>it wont be a pain to stop and start. What do you think.
>
>Thanks
>Mike
>
>
>--- In CAD_CAM_EDM_DRO@yahoogroups.com, Erie Patsellis <erie@s...>
>wrote:
>
>
>>Mike, I would seriously consider fixed end timing belts, or rack &
>>pinion. What is your desired resolution and budget?
>>
>>erie
>>
>>
>>surfbuilder2003 wrote:
>>
>>
>>
>>>Hey evryone....I have been having great feedback, thanks to all. I
>>>have also been looking through the faq page and have been getting
>>>some good info from there. I am starting to look for screws and
>>>steppers now. However, I do not want to make any critical mistakes
>>>and buy the wrong sizes. My table is going to be 10' x 4'. I have
>>>gotten some suggestions on my large screw. I heard it needs to be
>>>
>>>
>10'
>
>
>>>x 1.5" and I need at least a size 42 stepper motor to turn it. I
>>>
>>>
>want
>
>
>>>to connect all these directly, no belts or chains. I heard they
>>>
>>>
>dont
>
>
>>>last as long and make everything run slower and less precise. For
>>>
>>>
>my
>
>
>>>y axis I am going to get a 4' x 1" screw but do not know what size
>>>motor. And my z axis alls I know is I probably want a 2' screw but
>>>dont know what diameter or size motor. There will not be much
>>>pressure on the bit as alls I will be cutting is foam. Thanks in
>>>advance for any help.
>>>
>>>Mike
>>>
>>>
>>>
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