Hoss's G0704

[hoss2006]

Originally Posted by diyengineer Instead of hobbing my own gears for the belt drive, could one simply just buy a set offline that fit? I'm thinking about doing it! =)

If you're talking about the timing pulleys, the prints include a quill version using sdp-si.com timing pulleys with part #s.
still need a lathe to bore them and such.
if you just want to gear swap, they can be found here.
http://www.g0704.com/Projects.html
Hoss

[diyengineer]

Originally Posted by hoss2006 If you're talking about the timing pulleys, the prints include a quill version using sdp-si.com timing pulleys with part #s. still need a lathe to bore them and such. if you just want to gear swap, they can be found here. http://www.g0704.com/Projects.html Hoss

Thanks for the link i'll check that out!

I've seen this motor package below being talked about around the zone. $239 for the motor and $229 for the driver from keling. 3HP and 6000RPM with 3.5 N-M of TQ. Would that ever be a feasible upgrade in the future to come?
http://www.kelinginc.net/CNCmillingcontroller.html

[mwood3]

Originally Posted by diyengineer Thanks for the link i'll check that out! I've seen this motor package below being talked about around the zone. $239 for the motor and $229 for the driver from keling. 3HP and 6000RPM with 3.5 N-M of TQ. Would that ever be a feasible upgrade in the future to come? http://www.kelinginc.net/CNCmillingcontroller.html

very interesting...i havent seen that one yet even though i frequent keling and try to look at every single page over there.

I guess you could do rigid tapping and spindle indexing with that setup? would be something to look at.

[diyengineer]

Ya there are a few threads on the zone already. Looks pretty sweet so far. Hoss has already proved how much power the G0704 stock motor has, more then i will probably ever use but that would be a pretty sweet upgrade for ease of tapping, more power, and other features.

[arizonavideo]

Originally Posted by hoss2006 I made a video of the 570 motor current draw. Peaked at 1.7A at full speed, .51A at idle. That's as good as my meter can pick up. YouTube - G0704 570 Stepper Current Draw Excuse the breathing, not a well week.

First I think that you meter is not a true RMS meter so it may not be able to read pulsating DC vary well and could be off by a large amount.

The reason for this is the driver or load pulsates at 20KHz or more and many meters just don't deal with that well.

It might be more accurate with a normal meter to read the PS input current and convert to amps for the stepper. Most PS are around 90% efficient.

If you call the output 55V that would be 2 to 1.

If the readings are near correct then 1.7A x 3 would mean you only need a 6A supply for the mill and a 7A would leave room for a forth axes.

In the previous post some were saying to use over a 10A supply which is just not needed in any way.

One thing to look at is the difference in switching or coil power supplies. Most switching PS are some what over rated and just don't like pulsating loads and may need to be over sized to be reliable. Many switching supplies make RF noise or just burn out for no good reason.

A transformer will never just shout off or burn out under normal use. Short term over loading is just fine and failure in the first 10 years is almost unheard of.

For that reason for $20.00 more you can have a coil PS and be set for life.

Just don't buy a 16A transformer!

[mwood3]

Just ordered my CNC plans from Hoss, im patiently awaiting my email

Got the whole week to myself as the wife and youngun are out of town, should be a good week of mill modding

[mwood3]

Got the X axis motor mount done this Morning, sorry no pictures wife has the camera your not missing much anyways as im very rusty on turning handles manually. I think it would have come out better if I had a boring head setup, i was kinda at a loss for how to accurately cut the square hole. Im sure that is more or less for clearance anyways but i got it done.

Hoss, one thing I guess im overlooking is how to locate the two holes that must be drilled and tapped in the end of the X axis table. can you point me in the right direction on this? otherwise awesome set of prints and good pics.

[photomankc]

A boring head or a DRO would be real helpful. Keeping track of the expanding position plus backlash in the handles can be a chore. Rotary table would be another way to get round bores. Pre-drilling the corners and then dropping the center out as a slug could be easier too. Pretty simple to eyeball it that way.

I'm curious on locating the mounting holes properly as well. Wish I had a whole week of alone time in the basement. A couple of hours each night feels like I'm creeping along on it forever.

[mwood3]

Originally Posted by photomankc A boring head or a DRO would be real helpful. Keeping track of the expanding position plus backlash in the handles can be a chore. Rotary table would be another way to get round bores. Pre-drilling the corners and then dropping the center out as a slug could be easier too. Pretty simple to eyeball it that way. I'm curious on locating the mounting holes properly as well. Wish I had a whole week of alone time in the basement. A couple of hours each night feels like I'm creeping along on it forever.

I agree on the boring head, its my next tooling purchase...I doubt i will worry about the DRO as my goal is CNC anyways...I did make the Rev. B version of the motor mount(the one with the square hole) it will serve its purpose for phase 1 . I think i will probly remake it or go on to a fancier design after i have cnc up and running.

[photomankc]

Definitely. I plan to make the Z mount using CNC once X and Y are going. I'll just have to handle the plunge moves myself.

[diyengineer]

Originally Posted by mwood3 I agree on the boring head, its my next tooling purchase...I doubt i will worry about the DRO as my goal is CNC anyways...I did make the Rev. B version of the motor mount(the one with the square hole) it will serve its purpose for phase 1 . I think i will probly remake it or go on to a fancier design after i have cnc up and running.

This is going to sound silly but for to cut out the phase one kit, what tooling is minimally required. I was thinking about doing it manually but i dont have anything yet for it. Not even a vice. What would i minimally need to do the job? I was looking @ the 4" glacern vises, but after that i dont know what endmills and other do dads i need. maybe a mini list can get me going?

[hoss2006]

The x bracket is placed on the tables end plate centered on the hub and then mark
the 2 hole locations.
could use a small clamp tp hold the x bracket and drill the holes with a hand drill.

this starter package is a good one.
http://www.littlemachineshop.com/pro...gory=-74669629
others on my site under accessories.
Hoss