Gallery, Projects and General > The Design Shop
Gear Depthing Tool Plans- ideas, suggestions, plans, machining order
raynerd:
I'm guessing I'd need to keep 1.25" of meat at the bottom to give room from the spring clip and adjuster. That'll leave 1.75" to centre allowing a 3.5" maximum dia wheel. That would be a substantial wheel. Length wise, at 175mm - that's just short of 8" - having 1.5" sides also would give a distance of 5", about 100mm maximum distance between runners I.e max pivot size. Any thoughts?
tom osselton:
So why can't the hinge part of this just be a piano hinge all it does is open up.? The acuracy to me would be in the shaft suports and if there is enough room to drill and ream for the spring tension in the shaft to hold the gears.
BillTodd:
--- Quote from: tom osselton on May 30, 2014, 03:22:21 PM ---So why can't the hinge part of this just be a piano hinge all it does is open up.? The acuracy to me would be in the shaft suports and if there is enough room to drill and ream for the spring tension in the shaft to hold the gears.
--- End quote ---
It can be any kind of hinge as long as it is parallel to the axles - it is ensuring the alignment of all the parts that is critical.
raynerd:
Bill - did you see my earlier messages regarding ball bearing size?
I have brass and 15 of each, 4.5. 5. 6 mm ball bearings
Also, do you think a 1.5" frame all arounds sounds ok? I'd still appreciate any dimensions of your drawing if you have any.
BillTodd:
--- Quote ---Bill - did you see my earlier messages regarding ball bearing size?
--- End quote ---
Yes, the bigger the hinge balls the larger the opening (although this also requires a bigger diameter spring)
ATM I am experimenting with a 15mm ball. This gives it a 66mm axle spacing (not much point in holding one large gear only)
I've been looking around at bull dog clips the largest standard type clip (70mm wide) has a maximum throat of 17mm (the spring would probably open to 20+), which is a bit too small even with small ball hinges.
Anyone know of a source of larger springs?
This design is 3" x 170mm the arms and base are 25mm wide
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