VHF Touch Point Troubles

[CreDes]

I have a VHF from Jensen and I am consistently having trouble with divots being made on the plate. Thankfully this mill is a second/backup mill, but i still want it to be functioning better than it has been.
Sometimes it will mill 10 or so crowns, then make a huge divot, sometimes 20.
I have added the amplifier kit and still this does not help. My next step will be to change out the touch plate which is getting close to being flat.

 

[JMN]

I have a VHF from Jensen and I am consistently having trouble with divots being made on the plate. Thankfully this mill is a second/backup mill, but i still want it to be functioning better than it has been.
Sometimes it will mill 10 or so crowns, then make a huge divot, sometimes 20.
I have added the amplifier kit and still this does not help. My next step will be to change out the touch plate which is getting close to being flat.

If the interior is not perfectly dry the touch point can get a thin covering of dust preventing electron flow since zirc is an insulator. Just a thought if that hadn't been checked.

 

[CreDes]

Do you mean clean when you said dry? I clean after each mill, even if it is a single unit. I also clean the chuck more often than anyone should.

 

[adl]

Did you let Jensen know? Repeatedly?

 

[CreDes]

Did you let Jensen know? Repeatedly?

I have several times. I just keep moving the tpuch point. I may have to send it in.

 

[adl]

I have several times. I just keep moving the tpuch point. I may have to send it in.

Just moving the touch point it’s not going to help you. There is a lot more to it. Ask for a loaner and see how the loaner works for you.

 

[user name]

Im not a service tech, but it sounds like you may need to replace the cable that connects to the spindle.

 

[CreDes]

Im not a service tech, but it sounds like you may need to replace the cable that connects to the spindle. View attachment 29528

Thank you!

 

[adl]

I’m sure someone from Jensen whose active on this forum can help . Please help before CreDes is loosing any more time.

 

[user name]

Thank you!

Replacement may or may not be needed...I would certainly remove the machines cover and give a little push to the green connectors at the top of the panel. Your problem is continuity. Id also check the wire harness and how its zip tied on the lower right side. Mine was snugged down too securely, and when the mill was moving, a wire had too sharp a flex point and broke.
I hope Eliseo is helping you. Hes 'da man.

 

[CreDes]

They are saying rebuild the spindle. The Ohm reading is out the roof.
It is worth taking it apart and trying your suggestion. Thank you!

 

[cadfan]

They are saying rebuild the spindle. The Ohm reading is out the roof.
It is worth taking it apart and trying your suggestion. Thank you!

one is i think its called PTC which is addicted to the spindle a kind of wire threw the spindle the other is the contact btw. plate and rotary they added some kind of screw rotation secure rings which claw in the surface to close contact and help against zirkon dust and third spindle cable

 

[adl]

How long have you had the mill?

 

[Sevan P]

Usually continues back to back punching of the plate is mainly a bad spindle. I would say Z axis cable but those rarely go out. Mainly spindle is the issue for repeated continues punching.

 

[jdb-09]

I had exact same situation. Tech support said he'd heard of some people who steamcleaned their burs between millings.I gave it a try and have not had an issue in over a year.Touchpoint has not had to be moved yet over that timeframe and the plate is still pristine at the current point.

 

[CreDes]

How long have you had the mill?

4 years. It has not had a ton of usage. For the last year it has been a backup.

 

[Sevan P]

I had exact same situation. Tech support said he'd heard of some people who steamcleaned their burs between millings.I gave it a try and have not had an issue in over a year.Touchpoint has not had to be moved yet over that timeframe and the plate is still pristine at the current point.

So you steam clean the top part of the bur?

 

[Sevan P]

4 years. It has not had a ton of usage. For the last year it has been a backup.

=Never replace anything on it? Might be the brushes in the spindle landing in a low resistance spot. Only way to see is with a new spindle. Also remove the cover and blow off the board and components with clean air to get rid of the zr dust on there.

 

[Mike2]

I had issue initially when new and we went round and round. I had a tech in and he grounded the A axis motor? What I mean is, with the cover off there is a little train car that travels on rails. When it touches off, the signal goes through the touchpoint to this car and since it has metal wheels with metal bearings it could be the hitch in the continuity. Once the Jensen tech install a ground between that rail car and the frame of milll issues went away. I have steamed my tools ever since then, i believe it extends there life. PM if u want to discuss, but if Jensen says spindle, they have seen more failures than I. My 2 Cents

 

[adl]

Since it hasn’t been used a whole lot, you might just have a bad unit.