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Thread: Graduated Circumfral markings
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27th Nov 2015, 10:03 AM #1
Graduated Circumfral markings
I was thinking about making myself a traveller. I was wondering if there was an easy way to layout the graduations around the circumference?
Obviously there is a direct correlation between the diameter and the spacing.
For those who don't know a traveller is a wheel with a handle and a pointer, as you roll the wheel you count the full revolutions and the the stop point on the spot on the wheel and calculate the distance travelled. Large modern versions are used in serveying, in the old days they were a hand tool used by blacksmiths & wheelwrights, possibly others.
…..Live a Quiet Life & Work with your Hands
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27th Nov 2015, 10:43 AM #2Member: Blue and white apron brigade
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What about using it in reverse. i.e. rolling it along a 1m ruler and marking the various measurements on the wheel?
You should be able to get it within a mm
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27th Nov 2015, 10:59 AM #3
Hi Bob, I did think of that and wrapping a sewing tape measure around the outside but thought there should be a better way.
Mathematically I guess I can work back form a nominal circumference of say 300mm and get my diameter from that then divide the circle up into 300 segments. Now I need an indexing head lol.…..Live a Quiet Life & Work with your Hands
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27th Nov 2015, 11:42 AM #4
Hi Dale,
Looking at the design of that wheel, whoever made it had a real eye for line and proportion, it's a work of art.
Of course you wouldn't make a metric traveller, isn't it a law that you can only make them in imperial measurements.
Regard
Ray
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27th Nov 2015, 12:07 PM #5
If my steel comes in metric sizes then I can have a metric wheel.
…..Live a Quiet Life & Work with your Hands
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27th Nov 2015, 12:19 PM #6
Dale if you have a search for my Rivett 715 thread you will see how I did it in the drill press with a rotary table. I would think it may be easier to mark a certain number of graduations and then make your od to suit.
1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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27th Nov 2015, 12:20 PM #7
If you want a meter measured per revolution make your wheel 318mm diameter. ( thats 1000/3.1416 = 318.308 -rounded off to 318)
Make a marker wheel out of heavy ply and glue one of those give away paper tape 1meter measures they give away at Bunnings.
Glue the paper tape measure strip around the edge of the thick ply.
Divide it up into 5mm segments.
Lay your metal traveler wheel over the disc.
Using the center of the disc, pivot a straight edge and scribe a line off, at each of the 5mm segments.
Simples!
Grahame
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27th Nov 2015, 03:06 PM #8Most Valued Member
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Hi DSEL,
I assume you don't have a rotary table or the like otherwise it would be a no brainer. I'm happy to have you come over and use my RT on my mill. Put a scriber in the mill and scribe the lines at whatever inverval you like. If you used Gahames idea then with a 318mm diameter disc, 100mm distance segments would be spaced at 36 degree intervals……
Of course if you want to measure in light years then your gunna need a bigger wheel. I don't have a RT big enough for that!
SimonGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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27th Nov 2015, 05:26 PM #9Philomath in training
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Something like this is usually better Simon (sorry - not the best photo in the world)
P1020708 (Medium).JPG
Basically it is a ram with a travel stop so that the tool in the front (a bit of ground off tap in this case) can scribe a line of a fixed length. I can lend you this one if you like but it is heavy (sending the wheel here would be cheaper). I made it real quick for a one off job but have used it 5 or 6 times for other graduations.
Michael
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27th Nov 2015, 05:32 PM #10
Simon, Thanks for the offer I may take you up on that.
Michael, Does the bit of flat bar work as a length of stroke stop? Change out to get longer or short lines?…..Live a Quiet Life & Work with your Hands
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27th Nov 2015, 05:32 PM #11Most Valued Member
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27th Nov 2015, 07:08 PM #12Philomath in training
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28th Nov 2015, 12:03 AM #13Product designer retired
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Laser etching
DSEL74,
One of the boys over in the CNC forum might be able to laser etch the graduations for you.
I'm not sure just how deep they can etch, but that could be an elegant solution, or, if you are going to get the wheel laser cut, the laser cutter can laser etch the markings also.
Ken
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28th Nov 2015, 10:34 AM #14Most Valued Member
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You just whip that up in your lunchtime did you Michael?
Im keen to know the advantages in using that over putting a scribe in a collet on my mill?
DSEL, no problems....
Simon
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28th Nov 2015, 01:14 PM #15Philomath in training
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A little bit longer than a lunchtime, but it was a quick knock-together job.
The advantages as far as I see them are not enormous but are probably
- Because you are working to a fixed stop, it is easier to get a uniform line length
- The lever action makes it quick to do (index, stroke, stroke, index, etc) rather than wind in/ wind out
- A tool like that would be more rigid than a standard scriber
- The groove can be of variable profile if the cutter grind is changed
- Does not need the part to be mounted on a mill to be graduated
For the limited us I've made of it, it does the job well.
Michael
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