skatingforums
On the Ice => The Pro Shop => Topic started by: FigureSpins on September 22, 2010, 11:20:09 AM
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I just saw this on ebay: LINK (http://cgi.ebay.com/JBee-Trammel-point-for-scribing-scribe-compass-TP1_W0QQitemZ380239292093QQcategoryZ31483QQcmdZViewItemQQ_trksidZp4340.m263QQ_trkparmsZalgo%3DSIC%26its%3DI%252BC%26itu%3DUCI%252BIA%252BUA%252BFICS%252BUFI%252BDDSIC%26otn%3D10%26pmod%3D170540725982%26ps%3D63%26clkid%3D5503341390315041078)
The item is a small "point" that clamps onto beams 5/8" to 1-1/2" thick to create a scribe or compass. What could be used as a "beam" that would be convenient to transport to/from the rink?
The points can be replaced with pencils, ballpoint pens, crayons, or soapstone sticks for marking various materials. I guess you could put in a skinny marker as well, if you wanted to use it on the ice. I like the idea of being able to "switch out" the point instead of duct-taping or buying a sk8mate attachment.
I know we have a number of engineering-savvy members - what do you think about this for making a DIY scribe?
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Those look very similar to the Starrett Trammel set... http://www.starrett.com/download/314_p361_364.pdf (http://www.starrett.com/download/314_p361_364.pdf)
Starret makes expensive, but very good tools. Their trammel set (not just the points, which are sold as well) is $68. The eBay item copies the Starret design with some small changes to avoid litigation.
I'd not put too much stock into the claim of working with markers other than pencils.The pencil holder is meant for things of pencil size, and most markers are larger in diameter than pencils. While I don't have any crayons to measure, I suspect that they'd work OK because they are approximately the same diameter as a pencil. One possible issue could be crayon breakage. They aren't stout.
These are meant to be clamped to a piece of wood in use. For the large circles in figures, that means a long piece of wood. I brainstormed a bit for extendable items like radio antennas, but couldn't come up with something that would be easily available.
BTW, if you do a search for "trammel" on Amazon, you can find some really inexpensive versions. One from Grizzly industries (an importer of inexpensive tools) is only $7...
(http://ecx.images-amazon.com/images/I/41JlV6lxYxL._SL500_AA300_.jpg)
http://www.amazon.com/Grizzly-H5876-pc-Trammel-Set/dp/B0002U8BSG/ref=sr_1_12?s=gateway&ie=UTF8&qid=1285199220&sr=8-12 (http://www.amazon.com/Grizzly-H5876-pc-Trammel-Set/dp/B0002U8BSG/ref=sr_1_12?s=gateway&ie=UTF8&qid=1285199220&sr=8-12)
From the feedback, the only complaint is one I've already mentioned - it's made for pencil-diameter markers and won't work with Sharpies, etc.
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My kids have some skinny markers - I'll see how much larger than a pencil they are, but you're probably correct about the diameter. Thanks for the tips, though.
I though about a telescoping painter's pole instead of the wood, but I can see from the images you posted that it has to be a flat-sided piece of wood. Rats!
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I believe you can clamp a round pole with those. Lab equipment often has clamps like those and c-lamps are regularly used to hold pipes and tubes. You just won't be able to put a lot of force or weight on it.
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I believe you can clamp a round pole with those. Lab equipment often has clamps like those and c-lamps are regularly used to hold pipes and tubes. You just won't be able to put a lot of force or weight on it.
And if the size is such that it won't clamp securely, then whittle some flats into the round pole at two places.