What causes a grinding sensation when opening a tool

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Aug 13, 2020
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On any multi tool with tools that fold in and out, specially a Victorinox. I'm wondering because my recent purchases of victorinox knives, I've found on two of the five knives I feel a grinding sensation when opening some tools.

Firstly, on a Victorinox manager. When I open and close the screwdriver, there is this grinding sensation I can feel when it is open about two thirds of the way up. I also previously bought a Minichamp which did not exhibit the same thing with the same tool but when I went to return the Manager, the other ones had a very mild grinding when opening the same tool but not anywhere near as bad as on mine, so it may be tool specific. Still I'm wondering if this might me an alignment issue or maybe some rough edges on the metal where the back of the specific tool touches the spring.
I did check it carefully, I can't see if it's misaligned or not but there was plenty of oil and adding oil did not help with the situation either.

Second on my Evowood 14, the bottle opener tool grinds when I open it. It's much less pronounced and I do feel it might just be from lack of oil. I haven't oiled it yet because I'm afraid to get any on the wood. I thought about replacing it but the one I have has nice dark and evenly matched wood scales while the three remaining at the store have bland looking light colored scales.

The issue on the Manager is much worse, I can feel it in my hand holding the knife as well as on the hand prying the tool open. Neither one affects the usability of the knife or poses a safety issue but it's annoying and I consider it a quality control issue especially when all other tools on the same knife open and close smoothly.

I don't know if this is normal for the brand. I've not experienced it with my previous two knives, my Workchamp which I've had for 16+ years once thrown against a wall in a barfight which caused the ends of the layers (i don't know what they are called)to fold inwards, still opens and closes great after repair. My Spartan over 23 years old which has dried up in storage, still all the tools open and shut smoothly. I've also had about a dozen 58mm knives I've picked up from markets over the years and I don't recall any issue opening and closing them, then again I did not check too much on beat up old knives, most of which I've since given away or have had confiscated by airport security. Also I can't recall noticing it in any of my other knives, including cheap made in China brands.

I'm not an expert on this and my experiences are rather limited with knives. I'd like to know from people more knowledgeable than myself what the possible causes are, if this is to be considered normal or if it's worth the trouble of an exchange.
 
Just my personal observation, as the model gets smaller, the smaller tang and thinner layer/tools are probably harder to keep the blade/tool straight when pulling them in and out of the chassis. But the larger relatives like the 91mm have much stronger blade/layer and they tend to less likely to "bend". It doesn't happen all the time, and also largely dependent on how I operate the knife. If the potential tool 'rub' bothers you, maybe the dealer/store can take care of you if it is within warranty?
 
Have you flushed out the joints of the tool. I would flush with hit soapy water while working the tool joint and when finished relube it. Then I would work the tool to see if it smooths out the action.
 
On any multi tool with tools that fold in and out, specially a Victorinox. I'm wondering because my recent purchases of victorinox knives, I've found on two of the five knives I feel a grinding sensation when opening some tools.

Firstly, on a Victorinox manager. When I open and close the screwdriver, there is this grinding sensation I can feel when it is open about two thirds of the way up. I also previously bought a Minichamp which did not exhibit the same thing with the same tool but when I went to return the Manager, the other ones had a very mild grinding when opening the same tool but not anywhere near as bad as on mine, so it may be tool specific. Still I'm wondering if this might me an alignment issue or maybe some rough edges on the metal where the back of the specific tool touches the spring.
I did check it carefully, I can't see if it's misaligned or not but there was plenty of oil and adding oil did not help with the situation either.

Second on my Evowood 14, the bottle opener tool grinds when I open it. It's much less pronounced and I do feel it might just be from lack of oil. I haven't oiled it yet because I'm afraid to get any on the wood. I thought about replacing it but the one I have has nice dark and evenly matched wood scales while the three remaining at the store have bland looking light colored scales.

The issue on the Manager is much worse, I can feel it in my hand holding the knife as well as on the hand prying the tool open. Neither one affects the usability of the knife or poses a safety issue but it's annoying and I consider it a quality control issue especially when all other tools on the same knife open and close smoothly.

I don't know if this is normal for the brand. I've not experienced it with my previous two knives, my Workchamp which I've had for 16+ years once thrown against a wall in a barfight which caused the ends of the layers (i don't know what they are called)to fold inwards, still opens and closes great after repair. My Spartan over 23 years old which has dried up in storage, still all the tools open and shut smoothly. I've also had about a dozen 58mm knives I've picked up from markets over the years and I don't recall any issue opening and closing them, then again I did not check too much on beat up old knives, most of which I've since given away or have had confiscated by airport security. Also I can't recall noticing it in any of my other knives, including cheap made in China brands.

I'm not an expert on this and my experiences are rather limited with knives. I'd like to know from people more knowledgeable than myself what the possible causes are, if this is to be considered normal or if it's worth the trouble of an exchange.
Fine metal shavings and fine particles of sand can do this. Rinse it under hot water while you work it, then oil it up while you work it, that should clear it up. I found a beat up Spartan in the roadway, used hot water, tooth paste with an old tooth brush, kept working it, added oil while working it some more, now works like a new one. This did wonders to the springs. There was no snap at all but it's excellent now.
 
Thanks everyone. I did think at first there was some small bits of dirt or shavings from the manufacturing process that had not been cleared. I wiped it good and used a blower to try and get rid of anything that might be stuck behind the tool and the spring before oiling it again. I also spent a good 40 minutes in front of the television opening and closing it hoping it would smooth out whatever was causing the grinding, which did not help at all. I decided not to flush it out or soak it as it was new and still under the seven day period we get for replacement.

I got my (second) replacement today and everything is working well and the scales are nice and clean without any scratches. I have noticed, as well as on the other Managers at the store, the Phillips tool is rather stiff and just not as smooth as the rest of the tools on the same knife. It must be specific to this particular tool on this knife because the Minichamps that I had tried did not exhibit the same stiffness with the Phillips tool. It's actually very stiff and I noticed it came with an extra helping of oil on this particular knife. But as I've noted, it does not compromise the usage or safety of the tool and as long as it does not produce the same annoying grinding sensation as the first one, I'm good with it.
 
If I were you, I probably won't worry about the stiff phillips at all. In fact, a stiffer phillips is probably desirable for me, since I don't want it to close on me while using it.
 
Yeah, I'm not too worried about it. I just noticed that the stiffness occurs around the same area as where the grinding was on the previous knife. As long as there isn't that annoying grinding sensation or "tool rub" as you mentioned earlier, it's no big deal.
 
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