Mega V 4th Axis Assembly

[brianrussell]

Since there are no instructions available for assembly of the 4th axis that I was able to find, I assembled my 4th axis by some logical guessing.  Can other owners tell me if I got the assembly right?  Here is how I did it:

1. Took the base plate and added the tail stock rail to it with two screws from the bottom into t track nuts.  Slid the tail stock rail onto the t track nuts and tightened it down. 3 mm hex for this.

2. Added the motor to the aluminum bracket.  Cord facing out.  Used 4 screws inserted from the belt side through the aluminum bracket into the motor mount holes.  I put nuts on the motor side but not completely tight.

3. Added the large pulley to the chuck almost all the way in.

4. Add the smaller pulley to the motor with the belt across both pulleys.  Push on the motor until the belt is straight across both of the pulleys. I used a 2 mm hex to tighten the set screws of the pulleys.

5. Slide the motor over to tighten the belt up, then tightened all the motor screws/nuts down to lock it in place.

6. Screwed the motor/chuck to the base plate. 3 mm hex.

7. Assembled the tail stock (this is where I'm the most unsure if I did it correctly or not).

  a. Installed the bearings in the v wheels exactly like the main machine build video shows (hammer in one bearing, add washer in the middle, hammer in the other bearing)

  b. Put a v wheel on the shorter of the 4 screws, added the standard spacer, and screwed it into one side of the tail stock plate.  The screws didn't extend past the plate and were just right.  Repeat for the next one.

  c. Put a v wheel on the longer of the 4 screws, added the eccentric spacer, but the screw/wheel/spacer through the plate.  Added a washer and nut and tightened it down.  Repeat for the other wheel.

8. Screw on the tail center piece to the tail stock plate.

9. The two remaining screws go on the back of the plate in order to lock the tail stock in place.

Pictures attached

Attachments:

[brianrussell]

More pictures

Attachments:

[brianrussell]

Last Pics

Attachments:

[brianrussell]

I think I figured out the question of where those last two screws go. Right behind the tail center to lock it in place along the track.

[Derek the Admin]

Thanks for sharing. Really really sorry we don't have our own info up. I'm pushing as hard as I can on it, so thanks for covering down on it and sharing your info.

[brianrussell]

No problem. I like sharing the info. I'm waiting for a response from support about a z axis bearing that isn't working like it should. So I'm on hold from building the main machine right now. It allowed me to switch to this assembly while I wait.

[Bruce]

Thanks for the post and great pictures. Most have not seen this before. Congrats on your 4th axis build.

[thorn11166]

What is the max holding diameter?

[jv]

Mar 19, 2020 4:47:16 GMT brianrussell said:

More pictures

Thanks for sharing. I was able to put mine together off of this. One thing I’ll add is the gear for the 3 jaw chuck- push that gear almost all the way in. Then align the smaller gear off of that

[brianrussell]

Mar 22, 2020 10:37:55 GMT thorn11166 said:

What is the max holding diameter?

I didn't think of a good way to answer your question exactly, but here is a picture of the jaws at what I think could be at their max open stage and still rotate.  Note that there are two sets of jaws included.  One for smaller items and one for larger items.

Attachments:

[brianrussell]

Mar 22, 2020 10:37:55 GMT thorn11166 said:

What is the max holding diameter?

Here you can see the max diameter if you want to use the tail stock.  I included two measurements here because you can move the rail back and the tail stock to the end of it and have clearance all the way to the plate.

Attachments:

[brianrussell]

Mar 22, 2020 10:37:55 GMT thorn11166 said:

What is the max holding diameter?

Here is the max length between the chuck and the tail stock.  I'm thinking I could make a separate 1/4" plate to mount the tail stock anywhere along the bed if I wanted.  The picture shows the concept  I'm thinking.

Attachments:

[brianrussell]

Mar 23, 2020 2:35:47 GMT jv said:

Thanks for sharing. I was able to put mine together off of this. One thing I’ll add is the gear for the 3 jaw chuck- push that gear almost all the way in. Then align the smaller gear off of that

Thanks, I updated my instructions to be more clear.

[kevin56]

Thanks for theses instructions and pictures. My 4th axis came today and using this guide I was able to get mine together and up and running.

[recklessdriver]

Yes indeed Brian. Many thanks.

Best,
Kelly