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Author Topic: Testing testing  (Read 652 times)

Faceting Frank

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Re: Testing testing
« Reply #15 on: October 09, 2019, 11:28:29 AM »
Just come across your encoder thread Andrew, so will give that a read when I get the chance.

FlashGP

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Re: Testing testing
« Reply #16 on: October 09, 2019, 07:47:54 PM »
Thanks Frank.  I suppose it is also possible to zero the encoder at a point relarive to the surface of the lap to also deal with laps of differing thicknesses.

Regards
Gordon
Yours Sincerely
Flash (Gordon)

MakkyBrown

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Re: Testing testing
« Reply #17 on: October 09, 2019, 09:03:10 PM »
Hi Frank, It only flickers when changing between steps then constant. The flickering lets you know your almost at the angle you want.

Faceting Frank

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Re: Testing testing
« Reply #18 on: October 09, 2019, 11:01:08 PM »
That sounds good Andrew, looking forward to reading your thread.

You don’t have to zero the Vernier relative to the lap Gordon. Its not like an encoder where you need to have the dop lying flat on the lap to set the 90deg point. I lie a piece of 28mm square aluminium bar on the mast base and lower the quill base onto it and zero the Vernier. At 90deg the dop is probably about 10mm above the master lap, I don’t exactly  know what it is and it doesn’t matter.
For example cutting a row of 32deg facets on a 360 lap. I put my bevel box on the top of the quill base, rest the stone on the lap and alter the height till it shows 32deg. Set the dial gauge and start cutting, cutting the row of facets using the dial gauge as a stop as usual. When finished the Vernier may show a reading of 115.35mm. My next lap is a 600 grit and its 0.9mm thinner, so I lower the mast to 114.45mm and start cutting. May finish cutting at 114.25, the next lap is 1200 and its 1.15mm thicker. So alter the height to 115.4mm and start cutting.
Same sort of thing with the girdle, but the numbers may be 12.45, lower 0.9 and raise 1.15 just the same.

Faceting Frank

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Re: Testing testing
« Reply #19 on: October 11, 2019, 07:56:43 PM »
Correct me if I’m wrong, but keeping a record of height A on this Gemmasta for each row of facets would work the same as my mast. Not set up at the front where it would get in the way, but at the back.
As I said before the slider does not need to be fixed to anything and has tapped holes in the back to bolt on a suitable bracket. So you could slide it up to take a measurement when finished cutting each row of facets.



Prooz

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Re: Testing testing
« Reply #20 on: October 11, 2019, 08:03:44 PM »


Thanks MakkyBrown.
 Got it to work but still need some practice before doing anything complicated.
Hi Frank, I have been looking at your Bevel Box on line and also others. How do you find it? I have an old Hall machine it has a protractor on it, but when trying to find say 36.91Deg. I thought it maybe more accurate and quicker. Or is it not worth while. What are the dimensions of the one you have?

Regards Prooz

Faceting Frank

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Re: Testing testing
« Reply #21 on: October 11, 2019, 08:17:35 PM »
Hi Prooz,
Found it on eBay, “Dual Axis Digital Angle Protractor” is what it’s called model number DXL360S. Though I just searched for good quality bevel box and found this.
They claim to have an accuracy of within 0.05deg, though I can’t prove that it’s way beyond the bevel box I bought at Mitre 10.

Faceting Frank

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Re: Testing testing
« Reply #22 on: October 11, 2019, 08:20:25 PM »
Forgot the dimensions. 70x70x25

Prooz

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Re: Testing testing
« Reply #23 on: October 11, 2019, 08:28:20 PM »
Thank you Frank, I'll check those dimensions on my machine tomorrow, could be a bit large for were I want to fit it.

Cheers

MakkyBrown

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Re: Testing testing
« Reply #24 on: October 12, 2019, 12:33:37 PM »
re the bevel box.Dual axis makes me think it has a gyro in it, that will drift. If it has it would be good to have a known exact 90degree point(like sit it on your machines master lap) you could move it to to zero on a frequent basis.Could work well to set angles for hard stops with but not worth trying to cut with continually imo.CheersMB

Prooz

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Re: Testing testing
« Reply #25 on: October 12, 2019, 03:02:49 PM »
Thanks for the advice MB, yeah I don't think I'll go ahead with it, keep my $$'s in my pocket I think. And sit on the fence for a little while

Cheers Prooz
« Last Edit: October 12, 2019, 07:47:37 PM by Prooz »

Faceting Frank

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Re: Testing testing
« Reply #26 on: October 12, 2019, 08:31:29 PM »
It is consistent and always shows the same angle when I put it on the lap or something like a 45deg square on the lap. But for normal use the bevel box from your local hardware is easily good enough.

MakkyBrown

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Re: Testing testing
« Reply #27 on: October 12, 2019, 08:56:46 PM »
Interesting frank, maybe the drift isn't as bad in the orientation you are using it. All the gyros we used on the robots drifted. Even the high quality ones. You can apparently use multiple gyros and a Kalman filter to correct the drift but that math is beyond me. And definitely not worth it for this application.
Or maybe they have something else in them to correct for drift, I have bevel box lying around somewhere I'll have to pull apart for a look. Might even be the one pictured.
I'll see if I can find it.
CheerAndrew

Faceting Frank

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Re: Testing testing
« Reply #28 on: October 13, 2019, 02:11:38 PM »

 I’m assuming it’s something floating in a liquid making a contact on a globed surface and the software inside can work out where the outside casing is relative to it. I tried it on the lap five times today, parallel with the quill. After a couple of seconds to settle it always read from 89.97 to 89.99 degrees. It has always been consistent no matter what I put it on.

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