G0678 CNC Conversion Thread

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martyscncgarage
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Re: G0678 CNC Conversion Thread

Post by martyscncgarage » Wed Jan 24, 2018 10:31 pm

Nice work and thanks for the update Dave!
Marty
"Jack of all trades, master of none!"
Mesa, AZ

Dave_C
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Re: G0678 CNC Conversion Thread

Post by Dave_C » Thu Jan 25, 2018 1:09 pm

Grizzly G0678 CNC conversion with Acorn in progress!

martyscncgarage
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Re: G0678 CNC Conversion Thread

Post by martyscncgarage » Thu Jan 25, 2018 1:54 pm

Dave_C wrote:
Thu Jan 25, 2018 1:09 pm
Video's
https://youtu.be/rzBCprsDj10

https://youtu.be/kHi-lq5O2fE

Dave C.
Very nice Dave, boy you are gaining on it fast!

By the way if you want to put a preview of your YouTube videos in your message, Click on the YouTube button next to the NORMAL button above the mesage box put the youtube tag only inbetween the two bracketed YouTube words
for example rzBCprsDj10 AND kHi-lq5O2fE

Try it, just edit your message.....

Otherwise it works just fine!!

Marty
"Jack of all trades, master of none!"
Mesa, AZ

Dave_C
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Re: G0678 CNC Conversion Thread

Post by Dave_C » Mon Jan 29, 2018 5:31 pm

Progress Report:

I worked on my X and Y home switches today. I was able to make a "t-nut" type bar that fit in the original Y axis stop bracket. Since this was a nice sturdy bracket I just made a 4" long bar that fit in the slot, put a 1/4-20 set screw on one end and mounted the limit switch on the other end. The set screw lets me make fine adjustments if I need to move the switch. The down rod was already there as it was part of the original stop setup.

The X axis is not in the picture but I got it done later. Real simple, just a Honeywell Micro limit switch, not the cheap one, and it indexes off of the end bell on the table. It is mounted under the saddle but accessible if I need to replace it.

Motors are on order from Teknic along with some other minor stuff like the timing belt and pulleys for the Y axis, motor couplings and spider, X axis motor mount, and I think that will get me finished on the X and Y axis.

So no play until the stuff comes in!
0129181020.jpg
Dave C.
Grizzly G0678 CNC conversion with Acorn in progress!

cnckeith
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Re: G0678 CNC Conversion Thread

Post by cnckeith » Mon Jan 29, 2018 5:47 pm

looking good thanks for posting.

Dave_C
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Re: G0678 CNC Conversion Thread

Post by Dave_C » Wed Jan 31, 2018 5:45 pm

Progress Report:

Slow day, waiting on parts but the motor mount for the X axis came today as did the motor coupling. This is a cast iron motor mount and fits over the end of the bearing housing to make a nice clean aligned motor mount. You have to drill the pre-threaded holes the rest of the way through which removes the threads so you can bolt from the motor end into the table which hold the motor mount and the bearing in place using four 10-32 x 1.75" socket head cap screws.

I like this mount because it has some mounting spots that I can use to attached my tool table which goes over the top of the motor. Dual purpose idea, just like what Tormach does with the PCNC 1100. I'm going to add an additional idea by making some holes along the back edge to number and hold tools for jobs.

0131181401.jpg
I bought the mount from the same place I bought the ball screws. Automation 4 less.

Dave C.
Grizzly G0678 CNC conversion with Acorn in progress!

martyscncgarage
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Re: G0678 CNC Conversion Thread

Post by martyscncgarage » Wed Jan 31, 2018 5:53 pm

Dave_C wrote:
Wed Jan 31, 2018 5:45 pm
Progress Report:

Slow day, waiting on parts but the motor mount for the X axis came today as did the motor coupling. This is a cast iron motor mount and fits over the end of the bearing housing to make a nice clean aligned motor mount. You have to drill the pre-threaded holes the rest of the way through which removes the threads so you can bolt from the motor end into the table which hold the motor mount and the bearing in place using four 10-32 x 1.75" socket head cap screws.

I like this mount because it has some mounting spots that I can use to attached my tool table which goes over the top of the motor. Dual purpose idea, just like what Tormach does with the PCNC 1100. I'm going to add an additional idea by making some holes along the back edge to number and hold tools for jobs.


0131181401.jpg

I bought the mount from the same place I bought the ball screws. Automation 4 less.

Dave C.
Dave, this supports your thrust bearing as well correct? Very clean. Looks like all you had to do was adapt it to the original table end bracket?
"Jack of all trades, master of none!"
Mesa, AZ

Dave_C
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Re: G0678 CNC Conversion Thread

Post by Dave_C » Wed Jan 31, 2018 6:11 pm

Dave, this supports your thrust bearing as well correct? Very clean. Looks like all you had to do was adapt it to the original table end bracket?
Yes and No! This is a normal thrust bearing with the standard 40 mm round portion that normally is turned inside. (like I did on the Y axis front plate)

To use this motor mount you turn the 40 mm "stub" out and the motor mount fits precisely over the stub. Then just put the four bolts in and it all snugs up in line.

I went a step further and machined precise pockets on each of the support ends. I dialed in the existing bearing pockets for center and then using my DRO's I machined the square pockets and also did the bolt patterns. [this is why I made such a fuss about keeping the original ball screw center line both for height and front to back distance.

It worked out very well!

Dave C.
Grizzly G0678 CNC conversion with Acorn in progress!

martyscncgarage
Posts: 946
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Re: G0678 CNC Conversion Thread

Post by martyscncgarage » Wed Jan 31, 2018 6:35 pm

Dave_C wrote:
Wed Jan 31, 2018 6:11 pm
Dave, this supports your thrust bearing as well correct? Very clean. Looks like all you had to do was adapt it to the original table end bracket?
Yes and No! This is a normal thrust bearing with the standard 40 mm round portion that normally is turned inside. (like I did on the Y axis front plate)

To use this motor mount you turn the 40 mm "stub" out and the motor mount fits precisely over the stub. Then just put the four bolts in and it all snugs up in line.

I went a step further and machined precise pockets on each of the support ends. I dialed in the existing bearing pockets for center and then using my DRO's I machined the square pockets and also did the bolt patterns. [this is why I made such a fuss about keeping the original ball screw center line both for height and front to back distance.

It worked out very well!

Dave C.
Would it be possible for you to take a couple more pictures, maybe from the end etc or shoot a little video explaining it?

It looks very clean. I found the mounts on A4Less, a little pricey but sturdy.
"Jack of all trades, master of none!"
Mesa, AZ

Dave_C
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Re: G0678 CNC Conversion Thread

Post by Dave_C » Wed Jan 31, 2018 7:53 pm

Ok, Video it is!



youtu.be/kqLqRvMuCDI


Dave C.
Last edited by Dave_C on Wed Jan 31, 2018 8:45 pm, edited 2 times in total.
Grizzly G0678 CNC conversion with Acorn in progress!

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