BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications


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Thread: BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications

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    Default BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications

    I bought this mill a few years ago and have a items I could use some help with.

    When I first commisioned it, it was setup for 480 power. I have 240v 1 phase in my shop and a 15hp RPC and have reset the taps for the lower voltage. I had issues immediately with the Y axis throwing a gross positioning error when running in rapid traverse in the + direction. I changed the MP to slightly lower the maximum speed and called it good for now. I've noticed that the Y- axis feed is jerky when run with the wheel or a program. Any thoughts on what to look for?

    The other item is trying to connect to my PC to backup programs written on the control or to drip feed from my PC. I have a FTDI USB cable and TNCremo and TNCserver installed. I've read alot on the subject but don't seem to have a handle on exactly how to configure the MP, PC port settings and the TNCremo and server settiings. Then a step by step of the sequence for connecting and powering the machine and PC and then finally the sequence to copy progrmas to the PC and to drip feed to the machine.

    I've covered quite a bit here, but would really appreciate assitance from those with experience here.

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    Default Re: BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications

    Quote Originally Posted by pttech View Post
    I bought this mill a few years ago and have a items I could use some help with.

    When I first commisioned it, it was setup for 480 power. I have 240v 1 phase in my shop and a 15hp RPC and have reset the taps for the lower voltage. I had issues immediately with the Y axis throwing a gross positioning error when running in rapid traverse in the + direction. I changed the MP to slightly lower the maximum speed and called it good for now. I've noticed that the Y- axis feed is jerky when run with the wheel or a program. Any thoughts on what to look for?

    The other item is trying to connect to my PC to backup programs written on the control or to drip feed from my PC. I have a FTDI USB cable and TNCremo and TNCserver installed. I've read alot on the subject but don't seem to have a handle on exactly how to configure the MP, PC port settings and the TNCremo and server settiings. Then a step by step of the sequence for connecting and powering the machine and PC and then finally the sequence to copy progrmas to the PC and to drip feed to the machine.

    I've covered quite a bit here, but would really appreciate assitance from those with experience here.
    Check the lubrication there is a lot of weight on the Y axes on these machines it may be dry if it was sitting for any length of time

    You most likely don't need the RPC for this machine Just a VFD Drive for the spindle motor

    Mactec54


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    Default Re: BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications

    Quote Originally Posted by mactec54 View Post
    Check the lubrication there is a lot of weight on the Y axes on these machines it may be dry if it was sitting for any length of time

    You most likely don't need the RPC for this machine Just a VFD Drive for the spindle motor
    I bought the machine a surplus from a large airplane manufacturer who had converted X & Y to linear slides.

    I already had the RPC, but have been thinking about the VFD anyway. Already had some components burn up on the KTK drive which I was able to repair, thanks to reading a lot of posts on this forum



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    Default Re: BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications

    Quote Originally Posted by pttech View Post
    I bought the machine a surplus from a large airplane manufacturer who had converted X & Y to linear slides.

    I already had the RPC, but have been thinking about the VFD anyway. Already had some components burn up on the KTK drive which I was able to repair, thanks to reading a lot of posts on this forum
    Using RPC's have a habit of burning up electronics

    See if you can see the Ballscrew from under the knee like in this photo it needs lube this is a series I but yours is similar

    Be good to see if it was one I converted some years ago I converted quite a few of these machines to linear ways, I added extra travel in the Y axes by adding a block to the front of the knee, so some photos would tell me if I did it or not, if they did it themselves they most likely copied what I had already done, I modified the Heads as well removing 5" off the overall height of the head, series1 heads mostly but some series II

    Attached Thumbnails Attached Thumbnails BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications-bridgeport-y-axes-002-jpg  
    Mactec54


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    Default Re: BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications

    Quote Originally Posted by mactec54 View Post
    Using RPC's have a habit of burning up electronics

    See if you can see the Ballscrew from under the knee like in this photo it needs lube this is a series I but yours is similar

    Be good to see if it was one I converted some years ago I converted quite a few of these machines to linear ways, I added extra travel in the Y axes by adding a block to the front of the knee, so some photos would tell me if I did it or not, if they did it themselves they most likely copied what I had already done, I modified the Heads as well removing 5" off the overall height of the head, series1 heads mostly but some series II
    Looks like your handiwork. Embarrasing to see what it looks like under there now. Looks like I have some cleaning to do. BTW. It looks like it's getting plenty of lube on the screw and after running it back and forth a few times to look underneath I noticed that the jerkiness is gone. Could be there is just enough old dried up lube on the original ways to cause some sticking on the wipers.

    The linear ways have a a nice film of grease on them. What kind of grease would you suggest to use on them?

    Interested to hear about what you did to modify the heads. What was the goal with that? It looks like converting the ways raised the table a few inches. Mine came with a 3" thick aluminum fixture plate on it. If I put a vice on it I had almost no headroom.

    Also has Renishaw MP12 probe and OMM reader on it which I haven't figured out yet.

    BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications-20190902_105312-jpgBP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications-20190902_105400-jpg

    Attached Thumbnails Attached Thumbnails BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications-20190902_105312-jpg   BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications-20190902_105400-jpg  


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    Default Re: BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications

    Quote Originally Posted by pttech View Post
    Looks like your handiwork. Embarrasing to see what it looks like under there now. Looks like I have some cleaning to do. BTW. It looks like it's getting plenty of lube on the screw and after running it back and forth a few times to look underneath I noticed that the jerkiness is gone. Could be there is just enough old dried up lube on the original ways to cause some sticking on the wipers.

    The linear ways have a a nice film of grease on them. What kind of grease would you suggest to use on them?

    Interested to hear about what you did to modify the heads. What was the goal with that? It looks like converting the ways raised the table a few inches. Mine came with a 3" thick aluminum fixture plate on it. If I put a vice on it I had almost no headroom.

    Also has Renishaw MP12 probe and OMM reader on it which I haven't figured out yet.

    BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications-20190902_105312-jpgBP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications-20190902_105400-jpg
    Your linear rails look like they use Grease make sure you use the correct Grease for the rails, looks like they have Grease points front and back

    It's not one of my builds as my rails extended out more to give 2" extra travel, where the blue housing is on the front that had a 2.5" steel spacer block in front of it, I would say it was mostly dry, the oil pumps I used deliver the oil at 170 PSI for better lube

    You can see the ballscrew thrust bearing, the rebuilds I did I added a shield and a seal to keep the Bearings from getting junk in them

    There where different Heads so would need a photo of what yours has

    Mactec54


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    Default Re: BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications

    This is one of many Linear Bearing Grease https://www.thomsonlinear.com/en/product/LINEARLUBE

    Each Linear Bearing Manufacture have there own Grease

    Mactec54


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    Default Re: BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications

    Quote Originally Posted by mactec54 View Post

    There where different Heads so would need a photo of what yours has
    Here is my head. Don't know why the picture keeps wanting to rotate.

    I see now what you mean about the extension on the Y axis ball screw.




    BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications-bp-head-jpg

    Attached Thumbnails Attached Thumbnails BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications-20190902_105347-jpg   BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications-bp-head-jpg  


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    Default Re: BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications

    Quote Originally Posted by pttech View Post
    Here is my head. Don't know why the picture keeps wanting to rotate.

    I see now what you mean about the extension on the Y axis ball screw.
    Have not done any mod's to the Interact 4 Head, your machine looks in good shape

    Mactec54


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    Default Re: BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications

    Quote Originally Posted by mactec54 View Post
    Have not done any mod's to the Interact 4 Head, your machine looks in good shape
    It is a pretty nice mill. I've been very fortunate. I had an old ENCO BP clone as my first machine for about a year before getting this. It's a good balance for the work I do between manual and full cnc.

    I appreciate your suggestion on the lube. I'm still gettiing some jerkiness occasionally. Must still have a little too much resistance on the feed. How did you increase the pressure on the lube? Is cleaning the encoder scales a regular maintenace item I should do? Is that a difficult job on this machine?



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    Default Re: BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications

    Quote Originally Posted by pttech View Post
    It is a pretty nice mill. I've been very fortunate. I had an old ENCO BP clone as my first machine for about a year before getting this. It's a good balance for the work I do between manual and full cnc.

    I appreciate your suggestion on the lube. I'm still gettiing some jerkiness occasionally. Must still have a little too much resistance on the feed. How did you increase the pressure on the lube? Is cleaning the encoder scales a regular maintenace item I should do? Is that a difficult job on this machine?
    The lube pumps I replace with this type of pump

    I have never done anything with the original servos I always have replaced the servos Drives with AC servos drives and used different controls also

    Attached Thumbnails Attached Thumbnails BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications-lube-pump-jpg  
    Mactec54


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BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications

BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications

BP Series 2 Interact 4 with TNC2500 - Y axis feed jerky, serial communications