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IndustryArena Forum > MetalWorking Machines > Bridgeport / Hardinge Mills > Boss 8 CNC retrofit and 5 HP upgrade - Build thread
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  1. #21
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    Re: Boss 8 CNC retrofit and 5 HP upgrade - Build thread

    Quote Originally Posted by mongoose View Post
    post up some pics.. maybe !
    yes pictures
    and im subscribing

  2. #22
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    Re: Boss 8 CNC retrofit and 5 HP upgrade - Build thread

    So i got a bit of rust on the x ballscrew where bridgeport had an open are under the table. I have some bronze wool and some citric acid coming in. I figure ill try to get the rust off, and may even polish afterwards, not sure here. Its a $1000 mill so not sure how much it makes sense to spend on it. The screws seem like they are in very good shape otherwise.
    Attachment 437034

    The ways on the table look like there is very little wear and cleaned up nice:
    Attachment 437036

    One area I have been debating with myself is weather or not to replace all the way oil meetering valves. This mill is 25 years old, but clearly low hours. I have looked, and there are a ton of these things. I'm sure Id spend 500+ to replace them all. thoughts?

    Boss 8 belt size with servo:

    y axis 240h100 gates
    .5 pitch, 1" width, h belt, 24" long, 48 tooth

    x axis 220h100 gates
    .5 pitch, 1" width, h belt, 22" long, 44 tooth

    z axis 270h075 gates
    .5 pitch, .75" width, h belt, 27" long, 54 tooth

    Anyone know if the timing belt on the spindle low gear is the same a regular Bridgeport?

    The coolant chip guard is the same as this one:
    https://www.youtube.com/watch?v=AX7d...ature=emb_logo

  3. #23
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    Re: Boss 8 CNC retrofit and 5 HP upgrade - Build thread

    Quote Originally Posted by dbsharp View Post
    So i got a bit of rust on the x ballscrew where bridgeport had an open are under the table. I have some bronze wool and some citric acid coming in. I figure ill try to get the rust off, and may even polish afterwards, not sure here. Its a $1000 mill so not sure how much it makes sense to spend on it. The screws seem like they are in very good shape otherwise.


    The ways on the table look like there is very little wear and cleaned up nice:


    One area I have been debating with myself is weather or not to replace all the way oil meetering valves. This mill is 25 years old, but clearly low hours. I have looked, and there are a ton of these things. I'm sure Id spend 500+ to replace them all. thoughts?

    Boss 8 belt size with servo:

    y axis 240h100 gates
    .5 pitch, 1" width, h belt, 24" long, 48 tooth

    x axis 220h100 gates
    .5 pitch, 1" width, h belt, 22" long, 44 tooth

    z axis 270h075 gates
    .5 pitch, .75" width, h belt, 27" long, 54 tooth

    Anyone know if the timing belt on the spindle low gear is the same a regular Bridgeport?

    The coolant chip guard is the same as this one:
    https://www.youtube.com/watch?v=AX7d...ature=emb_logo

    Looks like its in great shape ! i would think if you see a ALL the ways being lubed you should be good.. or possibly figure a single point hookup before each metering valve ... and you could do a good visual since the table is off..

    would be interested in the chip guard if the price is right.. pretty simple design tho... could possibly make one as well...... lmk !

    thanks
    Joe

  4. #24
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    Jan 2005
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    10791

    Re: Boss 8 CNC retrofit and 5 HP upgrade - Build thread

    Quote Originally Posted by dbsharp View Post
    So i got a bit of rust on the x ballscrew where bridgeport had an open are under the table. I have some bronze wool and some citric acid coming in. I figure ill try to get the rust off, and may even polish afterwards, not sure here. Its a $1000 mill so not sure how much it makes sense to spend on it. The screws seem like they are in very good shape otherwise.
    Attachment 437034

    The ways on the table look like there is very little wear and cleaned up nice:
    Attachment 437036

    One area I have been debating with myself is weather or not to replace all the way oil meetering valves. This mill is 25 years old, but clearly low hours. I have looked, and there are a ton of these things. I'm sure Id spend 500+ to replace them all. thoughts?

    Boss 8 belt size with servo:

    y axis 240h100 gates
    .5 pitch, 1" width, h belt, 24" long, 48 tooth

    x axis 220h100 gates
    .5 pitch, 1" width, h belt, 22" long, 44 tooth

    z axis 270h075 gates
    .5 pitch, .75" width, h belt, 27" long, 54 tooth

    Anyone know if the timing belt on the spindle low gear is the same a regular Bridgeport?
    The Belt is a regular Timing Belt just measure it and you can get a replacement I may have one if you have the size that you have

    That C3 Ballscrew does not look so good with the rust on it, it looks like it has never had enough oil on it which can be a problem with the standard oil pumps on these machines

    Here is a photo of my table guard I made from 1/8" Aluminum sheet the corner posts where milled from bar stock the 2 ends just slide in which you can remove for long parts

    And Y axis Ballscrew after more than 15 years of use it does have custom way covers though
    Mactec54

  5. #25
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    63

    Re: Boss 8 CNC retrofit and 5 HP upgrade - Build thread

    Quote Originally Posted by mactec54 View Post
    The Belt is a regular Timing Belt just measure it and you can get a replacement I may have one if you have the size that you have

    That C3 Ballscrew does not look so good with the rust on it, it looks like it has never had enough oil on it which can be a problem with the standard oil pumps on these machines

    Here is a photo of my table guard I made from 1/8" Aluminum sheet the corner posts where milled from bar stock the 2 ends just slide in which you can remove for long parts

    And Y axis Ballscrew after more than 15 years of use it does have custom way covers though
    Mac, do you recommend upgrading the machine oiler to some other method ? is your chip guard mounted in the t slots like the oem unit ?

    thanks !

    JOe

  6. #26
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    Re: Boss 8 CNC retrofit and 5 HP upgrade - Build thread

    Quote Originally Posted by mongoose View Post
    Mac, do you recommend upgrading the machine oiler to some other method ? is your chip guard mounted in the t slots like the oem unit ?

    thanks !

    JOe
    No the Guard if mounted to the back flange of the table on the inside so the drainage and all T slots are clear along the back, this only works if you have the Boss Tables it has 3 1/4-20 SS screws that hold the back it in place and the corner posts have 2 10/12 tpi SS button head screws as well, it gives you the full table to use

    Yes the oilers need to be replaced the one's I have used are not cheap but run at 170 PSI 150 PSI is ok like this pump here they are every where so you can some times find a good price

    https://www.ebay.com/itm/202834043075
    Mactec54

  7. #27
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    Jan 2005
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    10791

    Re: Boss 8 CNC retrofit and 5 HP upgrade - Build thread

    Quote Originally Posted by mongoose View Post
    Mac, do you recommend upgrading the machine oiler to some other method ? is your chip guard mounted in the t slots like the oem unit ?

    thanks !

    JOe
    Just did this close up for you to see how it is mounted
    Attached Thumbnails Attached Thumbnails Guard Close Up.jpg  
    Mactec54

  8. #28
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    Re: Boss 8 CNC retrofit and 5 HP upgrade - Build thread

    thanks for the pic Mac... well as far as the oilers are concerned i actually dis-assembled the Bijur cleaned it thouroughly, changed the filter and tested it completely.. you have to be careful as some of the motors ( which look alike ) and all of the complete pumps pump at different rates... due to the timings of the pumps... and there are adjustments to the stroke of the pump.. and finally i bench tested it for 2 days and measured the output...

    now, this prompted me to look at my 2 boss' y screws... ( both machines are in a state of construction and havent been used in years... )

    so this made me think that maybe db's machine is just rusty from sitting .. possibly outside ? as we find many of these machines outside in the elements.. or in a un conditioned building...

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