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Machine Shop and Tool Talk Shop Equipment, fabrication, repairs, how to fix it, which tool to use for the job. Machinist shop talk, straight to the point.

Machine Shop and Tool Talk

Van Norman 777S4


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  #1  
Old 04-05-2017, 05:52:11 PM
storm storm is offline
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Default Van Norman 777S4

i bought this bar and it was badly abused but i have it going except for the catspaws.i didnt see this until i lowered the shaft and saw one of the catspaws missing then i looked and the hole is empty.nothing to attache the paw to what all is involved to fix this.
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Old 04-06-2017, 11:13:22 AM
John Dunn John Dunn is offline
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Default Re: van norman 777s4

It sounds like you are missing one of the master jaws. No easy fix, the master jaws are made in a set to match the scroll like in a 3 jaw lathe chuck. You would have to swap the scroll and jaws from another machine I think.
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Old 04-06-2017, 11:34:58 AM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: van norman 777s4

One jaw can be replaced but you have to grind them to match, should be done on a tool post grinder or crank grinder. The post is tricky to remove, I think you have to remove a plate to run it out, should see something on then net.
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Old 04-06-2017, 11:52:25 AM
storm storm is offline
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Default Re: van norman 777s4

thanks i had someone look at it who used to own one and thinks i should be able to centre it with 3 paws but i cant see it.

---------- Post added at 10:52:25 AM ---------- Previous post was at 10:49:01 AM ----------

forgot to ask what is involver in replacing the one jaw.do i have to take it all apart.the worst think i find is theres all kinds of info but no pictures of how to work on this bar
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Old 04-06-2017, 10:43:42 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: van norman 777s4

You could probably ge it fairly centered by wedging it against the odd paw, but one of the best features of these bars is the fact that you can expand the paws after it enters the bore and support it to the bottom, virtually no chatter.
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Old 04-07-2017, 07:40:14 AM
storm storm is offline
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Default Re: van norman 777s4

yes i think i can get it close if i take my time but i would still like to fix it.i talked to someone who ran his bar for years without expanding the paws.didnt know he was supposed to with good results.i can find nothing showing how to take this piece apart.if fact theres little online thats of any use period.there must be someone whos taken this apart.thanks again.
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Old 04-07-2017, 01:25:26 PM
Jim Parrott Jim Parrott is offline
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Default Re: van norman 777s4

The cutter head on mine was very tight due to it is mounted on a tapered shaft. It can be removed by holding the flats on the very top of the shaft and using a 1/2" rod on the bottom. Attached are a couple pics of one disassembled. Do not disassemble the machine as it is made to be removed for periodic maintenance. The threads are right hand. Hope this helps.

Jim
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Old 04-07-2017, 07:07:17 PM
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Default Re: van norman 777s4

thanks thats the best ive seen.where would a person ever find the parts.i dont think you can buy it new.everyone has been a great help.ive waited 44 years since i last ran one.i wanted it so bad i didnt look to close.
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Old 04-07-2017, 07:13:05 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: van norman 777s4

Jim is busy though Monday, he will get back to you. I googled and found this site, others popped up.
http://www.winonavannorman.com/produ...s-boring_parts
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Old 04-10-2017, 10:10:22 AM
Jim Parrott Jim Parrott is offline
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Default Re: van norman 777s4

Storm,

Any luck getting the cutter head off, and I'd so what did you find?

Jim
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