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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
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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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  #2  
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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  #3  
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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  #4  
Old 04-06-2017, 11:52:25 AM
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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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  #5  
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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  #6  
Old 04-07-2017, 07:40:14 AM
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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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  #7  
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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  #8  
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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  #9  
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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  #10  
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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  #11  
Old 04-10-2017, 11:47:53 AM
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Default Re: Van Norman 777S4

i didnt try as i saw no sense if i couldnt get the parts.im reaching the point that im going with the 3 paws and see how close i can come.i dont have the jig for holding the cutter to sharpen it nor the diamond disc.they were sharpening it with a stone of somekind which is clear to see.this poor old bar had a dogs life.im going to see if i can find someone with a bar that will sharpen it so i can try it out.i dont want to spend any more money till i see if this thing is worth it.does anyone have a jig they want to sell.
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  #12  
Old 04-10-2017, 09:42:25 PM
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Default Re: Van Norman 777S4

rather than trying to find someone with a bar i ordered a new bit.they are 20.00 so not to bad.i see i can order a diamond disc that i guess you glue to the wheel as i have the wheel.what do they use to hold it on.i just have to slow down with this thing and it may work out.
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  #13  
Old 04-10-2017, 10:29:34 PM
Jim Parrott Jim Parrott is offline
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Default Re: Van Norman 777S4

Storm,
My disc looked like bare metal, but I tried it and it sharpens fine. I did read that you can use diamond paste on a wheel that needs recharging. Parts and manuals are available. Call the link listed above and the ones below as theirs used inventory changes often. Ebay always has a bunch of parts also. Also try posting what you need on smokstak's classified.
Jim

www.cavcosales.com
http://www.beamequipment.com/Cylinde...an_Norman.html
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  #14  
Old 04-13-2017, 05:33:59 PM
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Default Re: Van Norman 777S4

back with another question.will the jig holder for sharpener the bit for a 777s work on my 777s4.my bar has a different one for cutting sleeves which i dont plan on using as the bit is cut different for hard sleeves.will the 777s jig fit my bar.
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  #15  
Old 04-14-2017, 10:41:06 PM
Jim Parrott Jim Parrott is offline
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Default Re: Van Norman 777S4

I am not sure but there are several 777S and one 4S holders on eBay right now.
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  #16  
Old 04-15-2017, 06:47:45 AM
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Default Re: Van Norman 777S4

yes i know jim but the s4 jig is different as these bars were made for sleeve work cutting hard sleeves and the bit does not have the same edge.as far as i know the s jig will work i think the 4 in s4 just means 4 speeds and the bars are more or less the same.dont want to order something i cant use.
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  #17  
Old 04-15-2017, 11:29:14 AM
Jim Parrott Jim Parrott is offline
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Default Re: Van Norman 777S4

Give Winonna Van Norman, Cavco, or Beam a call and ask for their input. They should have the correct answers to your questions. When I talked to them they even knew the year of my machine.

Jim
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  #18  
Old 04-21-2017, 07:26:41 PM
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Default Re: Van Norman 777S4

i was looking at a lapping disc on ebay and it says fine grit 9/16 5/8 15mm.are they talking about the size of my motor shaft or what.if they are mine is .590
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  #19  
Old 05-17-2017, 04:03:08 PM
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Default Re: Van Norman 777S4

cut my first hole today nice smooth cut.ordered a new cutting bit am using a scrap 350 block.i can get it centered on 3 paws so no problem.now that i know its a good bar ill order the jig for holding the cutter and diamond wheel.
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  #20  
Old 05-30-2017, 07:28:15 AM
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Default Re: Van Norman 777S4

another question is the shaft on the 777s4 bar thicker than a 777.mine measures about 2 1/2.theres a reason for this question as i ordered a short bit holder for a 777 thinking its the same now im wondering.
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