Philbert
Chainsaw Enthusiast
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- 737
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- Jan 30, 2016
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Couple of 'geeky' comments for DIY'ers . . .
First, to reiterate a few things:
- not everybody wants to use these;
- if you just want one, it is much easier to just buy one (at least 4 vendors are referenced in this thread);
- if you just want one, and have to buy all the materials, it is probably cheaper to just buy one;
- that said, some guys just like to do things themselves; or want a custom version; or have all the materials sitting around, and it's raining, and they are out of beer . . . .
The actual sticks could be from a variety of sources. We mentioned driveway markers, electric fence posts, old arrow shafts, tent poles, . . . I have started looking funny at old fishing poles, golf clubs, and TV antennas at garage sales. I prefer something non-metalic, in case of accidental contact with the saw, but soft aluminum may be OK.
The rare earth magnets ('neodymium') are the heart of these measuring sticks. They are super strong, and when placed in a metal cup, the magnetic force is focused to one side, dramatically increasing the holding power. So what you want to buy are 'neodymium cup magnet assemblies'. These are available on eBay, Amazon, etc., with a countersunk hole for a screw, or with a male threaded stud, or a female threaded post.
1 inch diameter cup magnets are rated around 40 pounds of holding force. A 1.25 inch diameter magnet jumps up to 70 pounds of holding force! The same magnets without the screw holes have higher holding power (very noticeable, but not always rated differently by the vendors).
Here's the geeky part: thinner, more flexible sticks do not need as strong of a magnet, since they flex before they pry the magnet off of the guide bar. This might happen if the stick brushes against a limb while cutting branches. Thicker, stiffer sticks need a stronger magnet, since a smaller movement of the tip will apply leverage against the magnet.
Have fun. Be safe. And please post photos and comments of any you try in this thread.
Philbert
First, to reiterate a few things:
- not everybody wants to use these;
- if you just want one, it is much easier to just buy one (at least 4 vendors are referenced in this thread);
- if you just want one, and have to buy all the materials, it is probably cheaper to just buy one;
- that said, some guys just like to do things themselves; or want a custom version; or have all the materials sitting around, and it's raining, and they are out of beer . . . .
The actual sticks could be from a variety of sources. We mentioned driveway markers, electric fence posts, old arrow shafts, tent poles, . . . I have started looking funny at old fishing poles, golf clubs, and TV antennas at garage sales. I prefer something non-metalic, in case of accidental contact with the saw, but soft aluminum may be OK.
The rare earth magnets ('neodymium') are the heart of these measuring sticks. They are super strong, and when placed in a metal cup, the magnetic force is focused to one side, dramatically increasing the holding power. So what you want to buy are 'neodymium cup magnet assemblies'. These are available on eBay, Amazon, etc., with a countersunk hole for a screw, or with a male threaded stud, or a female threaded post.
1 inch diameter cup magnets are rated around 40 pounds of holding force. A 1.25 inch diameter magnet jumps up to 70 pounds of holding force! The same magnets without the screw holes have higher holding power (very noticeable, but not always rated differently by the vendors).
Here's the geeky part: thinner, more flexible sticks do not need as strong of a magnet, since they flex before they pry the magnet off of the guide bar. This might happen if the stick brushes against a limb while cutting branches. Thicker, stiffer sticks need a stronger magnet, since a smaller movement of the tip will apply leverage against the magnet.
Have fun. Be safe. And please post photos and comments of any you try in this thread.
Philbert
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