Re: Fw: [CAD_CAM_EDM_DRO] Re: PWM vs Constant current and G-rex

Jarrett,
where are you located?

erie

Jarrett & Heidi Johnson wrote:

>Ron, see.. this is where I go into a nose dive, I'm NOT and electronics guy
>so the more 'plug and play' type stuff I can purchase the better. I wish the
>suppliers of some of this stuff would post links to show which power-supply
>they recommend for their boards and drives, it would make my life alot
>easyier.. I realise that it might vary depending on the size of different
>things but.. even a chart to kinda get the feel for what I need would be a
>start!
>
>I'm actually looking to build a system from the ground up. My intent is for
>hobby [at least to start] use only creating composte molds and bucks [ male
>parts of which molds are then pulled off of] The total size is fairly large
>as some of the parts would have a fairly decent foot-print [ I keep using a
>car hood as a refrence] The system is for only milling foam [ and possibly
>some MDF on occasion-however this would constitue a fairly hard/heavy cut
>for my system] I've heard of people building 5 axis positional systems of
>which over time I hope to reach myself.. however this is some time down the
>road. If I can get a 3D mill working to cut foam for starters.. I'll be one
>happy camper.. [ so will She who must be obey'd as she's ok'd this project..
>and I think she's havin second thoughts after hearing my plans--her poor VW
>Bug is gonna end up out on the street YET! :-P ] I've got most of my
>mechanical stuff designed and am working on the electronics of it all. I've
>been looking at websites for a couple weeks now. Its become my full time
>'second' job :-) . The mechanical side is a floor mounted bed, channel
>cross members and two HSS side beams and with angle iron linear rails
>mounted either side of both beams kinda like <[]> and then excentric
>cam follower bearings [ 12 to each side of the gantry for a total of 24 on
>the x-axis of the gantry] The y axis is mounted at the top of the gantry
>and uses the same principle only the angle irons' are turned 90Deg [ upper
>one under the top HSS x-member and the lower one on top of the lower HSS
>x-member which creats like an X profile [ center of the X is split by
>12"] ] and the same cam follower's ride on this [8 followers on the y-axis].
>The Z I haven't nailed down how I'm going to do it just yet. Might just buy
>a linear slide instead of fabricating it all since it won't be as long as
>the rest. It has all been designed in Solidworks [ at least as far as I've
>got anyway] I'm hoping to make it modular so that the length and possibly
>the width can be increased if required at a later date. One issue I've come
>across is finding lead screws of some sort that are long enough. Most Acme
>screws are all 72" at best and haven't found much longer than that.. well
>McMaster has a Ball Screw that is 20' long but they want $1000 for 1 screw
>.. however I might still go that route.. we'll see. I've been thinking I
>might have to go to a belted style drive if I can't get something to work..
>I think it would be more accurate than just a simple threaded rod. Accuracy
>isn't a huge concern for me as machining foam isn't an exact science. If I
>can keep most of my parts to about +/- 1/16" I'd be pretty happy. If I get
>the accuracy better than that I'm hopeing to spray the foam w/ a high build
>primer after the ruff cuts and then re-machine to a better finish. We'll
>see what happens.
>
>One other thing I'll mention [ after re-reading the above] is that I might
>use a single stepper to drive the x-axis and have it belted out to either
>lead screw via a timed belt and just run a huge 400-600 oz/in stepper in the
>center, save having issues w/ the system going out of sqr by losing stepps
>on 1 stepper [ if I was to use two steppers- 1 on each lead screw].
>
>I should mention that before I build all this I plan on building a MDF proto
>just to get all the electronic's working and then start fabrication of the
>larger unit.
>
>Anyway.. big hopes and ideas at this point.. just hope I can get the
>electronic's all figured out so as to get it all working!
>I'm sure alot of you ppl on here have heard it all so .. if anything sounds
>totally out to lunch... let me know.. I might as well find out about it now
>rather than later!!
>
>Jarrett Johnson
>
>
>
>----- Original Message -----
>From: "R Rogers" <rogersmach@...>
>
>
>
>
>
>>Jarret,
>>
>>Yes, you'll need a power supply for whatever motors you decide to use and
>>the Geckos use that same power to operate I think, not sure about that.
>>They dont need their own external power supply to operate. . I'd invest
>>alot of time reading and researching these forums and the internet. What
>>type of machine are you wanting to retrofit and what type of motors are
>>you wanting to use? The breakout referenced below is the same type that I
>>use on all my machines and has given me excellent service.
>>
>>Ron
>>
>>
>
>
>
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