[4]

New PM 1440-GT

[3]
[10] Like what you see?
Click here to donate to this forum and upgrade your account!

scott55

Swarf
Registered
Joined
Jan 12, 2017
Messages
17
Likes
10
#1
Finally got the new lathe.
Precision Mathews 1440-GT
Now to figure out the VFD wiring so I can use it. :)
 

Attachments

wrmiller

Chief Tinkerer
H-M Supporter - Gold Member ($25)
Joined
Mar 21, 2013
Messages
3,386
Likes
1,367
#2
Very nice. :)

I have a VFD on both my 935TS and my 1340GT, and will say that the lathe is the more complex of the two to install a VFD on. I originally did my own install, but later bought a setup from Mark as I wanted his electronic stop.

You'll love having the VFD on the lathe. It just makes dialing in the cut so much easier.
 

scott55

Swarf
Registered
Joined
Jan 12, 2017
Messages
17
Likes
10
#3
I have the 940-TS and now the 1440-GT.
I did the 940 VFD on my own and it was not too bad.
I used the Fuji VFD on that one because I did not know Matt had such a good deal on the Hitachi, and that there was more info available on the Hitachi here.

I got the Hitachi for the lathe and I am thinking of just gutting the electrical system and wiring the lathe switches directly to the VFD, but I am only at the thinking stage so far.

I do have to say the Fuji manual is rather cryptic about a lot of the settings
I have not dug into the Hitachi manual just yet, only got the machine Thursday.

What are the advantages of keeping any of the factory relays/wiring etc.?
Also what is the "setup" you bought from Mark?

thanks,
Scott
 

mksj

Active User
H-M Supporter - Gold Member ($25)
Joined
Jun 12, 2014
Messages
1,857
Likes
2,269
#4
I do not recommend wiring the VFD directly to the spindle controls for safety reasons and you are also do not take into account the foot brake, E-Stop or any of the other safety features. I had previous outline a very simple conversion (basic) which uses the contactors to switch the VFD inputs and also maintains all the safety features of the lathe. Each 1440GT seems to have some variants on wiring, so you need to have a basic understanding of what your are doing in the conversion. With the foot brake, you should issue what is know as a free run command to the VFD which negates the VFD braking when using the foot brake. This requires replacing the brake switch form a single pole to a dual pole, one side trips the power realy (default) the other side issues a free run command to the VFD. Otherwise they will fight each other. Note, the VFD input run commands are completely separate from the machine low voltage circuit. The details of the conversion and programming have been outlined in the following thread:
https://www.hobby-machinist.com/thr...he-contactors-to-switch-the-vfd-inputs.64965/

You must use an external braking resistor with the VFD on a lathe, there is too much momentum otherwise. There have also been other postings with suggestions as to VFD cabinets, venting, switch gear and fusing. If you can't find it send me a PM with your email and I can send the files.
Mark
 

Nogoingback

H-M Supporter - Gold Member
H-M Supporter - Gold Member ($25)
Joined
Oct 18, 2016
Messages
873
Likes
691
#5
I do have to say the Fuji manual is rather cryptic about a lot of the settings
I have not dug into the Hitachi manual just yet, only got the machine Thursday.


thanks,
Scott
I have a Hitachi VFD on my lathe. Despite the having no prior experience with VFD's, I had no trouble
programming it after studying the manual a bit. I'd say it's pretty well written.
 

wrmiller

Chief Tinkerer
H-M Supporter - Gold Member ($25)
Joined
Mar 21, 2013
Messages
3,386
Likes
1,367
#6
I have the 940-TS and now the 1440-GT.
Also what is the "setup" you bought from Mark?

thanks,
Scott
Speaking of Mark (mksj), and here he is. :)

I would take him up on his offer to send you the files. Plus, he's a wiz at programming these things. I do not know if he is still making control systems for folks though. You could ask.
 
[6]
[5] [7]
Top