Tip issue

S

scoooter961

New member
Hello, I’m working on a customers Pechauer rogue shaft and have had 2 of Samsara tips pop off within weeks. I used Loctite on one and epoxy on the other. Any thoughts as to why they won’t stay on? Side note I’m using a Porper lathe that I’ve been using for 26 years so it’s not my first time I just haven’t had an issue like this in a long time and I don’t want to keep throwing tips at it.

Added: a picture of it. To me it looks like the glue isn't adhering to the tip...
 

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scoooter961 said:
Hello, I’m working on a customers Pechauer rogue shaft and have had 2 of Samsara tips pop off within weeks. I used Loctite on one and epoxy on the other. Any thoughts as to why they won’t stay on? Side note I’m using a Porper lathe that I’ve been using for 26 years so it’s not my first time I just haven’t had an issue like this in a long time and I don’t want to keep throwing tips at it.
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With your extensive experience I can only imagine the adhesive is the problem. I hope others can chime in with how they solved this dilemma. Good luck.
 
Machine the face flat and smooth. I use 220 grit to sand the back of the tip flat. Check it against the face of the ferrule or pad. I use loctite gel super glue. Trim and shape as you normally do. Me personally I cut the tip down a bit, like a layer or two. That way if the person breaking is a bit squirrely there is less tip there that can be forced sideways if that makes sense. Less chance of it being sheared off is best I can describe it.
 
jokers_wild96 said:
Machine the face flat and smooth. I use 220 grit to sand the back of the tip flat. Check it against the face of the ferrule or pad. I use loctite gel super glue. Trim and shape as you normally do. Me personally I cut the tip down a bit, like a layer or two. That way if the person breaking is a bit squirrely there is less tip there that can be forced sideways if that makes sense. Less chance of it being sheared off is best I can describe it.
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Thanks, that's basically exactly what I do.
 
I recently had the same problem, make sure everything is flat. That was my issue. The third time I put a tip on I made a jig to hold the tip in my lathe and faced it flat. I primed it with superglue and faced it again without moving the cross slide. Stayed on after that. Unfortunately I’m human and make mistakes 😳
 
Rodney said:
I recently had the same problem, make sure everything is flat. That was my issue. The third time I put a tip on I made a jig to hold the tip in my lathe and faced it flat. I primed it with superglue and faced it again without moving the cross slide. Stayed on after that. Unfortunately I’m human and make mistakes 😳
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Get rid of that fiber pad they use. They suck. Add an impact pad.
 
Flat surfaces, scuff with 320. Flat being the key. If you sand the tip, do it very carefully, it's easy to fail here.
Magic eraser with denatured alcohol to clean the ferrule. DO NOT TOUCH WITH FINGERS
Prime the tip with thin superglue, immediately wipe excess. See above
Very light spray of accelerator on ferrule
Superglue gel on tip placed gently. Make sure it covers the entire surface of tip and ferrule. Move it around as little as possible.
Light pressure from tailstock
 
scoooter961 said:
Hello, I’m working on a customers Pechauer rogue shaft and have had 2 of Samsara tips pop off within weeks. I used Loctite on one and epoxy on the other. Any thoughts as to why they won’t stay on? Side note I’m using a Porper lathe that I’ve been using for 26 years so it’s not my first time I just haven’t had an issue like this in a long time and I don’t want to keep throwing tips at it.

Added: a picture of it. To me it looks like the glue isn't adhering to the tip...
Click to expand...
Clean with 90+% isopropyl alcohol and use gorilla glue gel CA. Do as mentioned about flat surfaces.
 
By the picture posted, the pad doesn't look flat. It looks dished in, in the center. Probably isn't but the picture sure looks that way.
Try refacing it and take something you know is flat, like an xacto blade and check it.
You can see a definite circular ring about a 1/3 of the way in. That shouldn't be there if both surfaces were flat.
 
I've had two tips pop off, one I blamed on old glue (had been opened for well over 30 days) the other was new glue and I didn't want to take anymore chances so here's what I started doing. I would cut the old tip off almost completely, leaving just a sliver. Then, I would take an empty tool post and align it with a 1, 2, 3 block so it was perfectly perpendicular to the end of the shaft by using the carrier as a guide. Then use some 220 grit sandpaper and put it between the two and gradually move the tool post to the ferrule while pulling the sandpaper through it. At first you'll see the brown from the tip on the sandpaper and when it turns white, and you know all of the old tip is gone you should be good. I only use Kamikaze tips and they have "Glue" embossed on them so I would sand until that was completely gone and then, with one finger, I would drag it across for a few final passes. Then I use those little alcohol wipes on both parts. I've never had a problem since then. In the end I determined that even the slightest bit of play will create a concave or converse, more than likely converse, shape on the end of the shaft and by using the sanding method with the tool post it eliminated that issue.
 
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