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Messages - MakkyBrown

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1
General Discussion / Re: Testing testing
« 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

2
General Discussion / Re: Testing testing
« 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

3
General Discussion / Re: Testing testing
« 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.

4
Gemstone Faceting / Re: MB concave build
« on: October 08, 2019, 10:21:52 PM »
I plan to cheat a bit flash if I have too and use the pivot of the concave cutter assembly to help with the alignment. :) Maybe i could make an adjustable 0 indicator.
I am about to start focusing on book volume two, I have 80 designs to work though, start test cutting and formatting and remove a few with the aim of having 60 really good designs I am happy with for book volume 2.So concave machine will be on hold of a bit until I get on top of the book. :)I am really happy with how most of the new designs render and can't wait to cut them  ;D
I'm thinking it will be better than volume 1.
CheersAndrew

5
General Discussion / Re: Testing testing
« on: October 08, 2019, 10:07:18 PM »
Hi Frank,
I am using a 5000cpr/20000ppr encoder it gives me 0.018 degree steps, it is the only real known accurate constant on my machine. I don't use a hard stop just the encoder. I would'nt go anymore as lap flicker would make it very hard to use but as it is it's really nice. I had a 1250cpr encoder and swapping to the 5000cpr I couldn't go back. ) 
I never use a mast height measurement when I'm cutting. I might when I get around to building my new machine, but that would be automated.
With an encoder the accuracy is a lot higher than the degree steps as I use the change to a new reading as the stop.
CheersAndrew

6
General Discussion / Re: Testing testing
« on: October 04, 2019, 12:04:09 PM »
Thanks.
I used 25mm aluminium square bar for the mast.
If you’re going to build your own machine then I would base it on this.
 https://www.jrobertslater.com/homebuilt-faceting-machine
I’m sure this link would have been posted on this forum before, though I don’t know  anyone who has built one.
If I was building one from scratch, I would make the faceting head and mast the same as his, fitting a digital angle encoder would be brilliant. On the subject of encoders, I think I came across some one’s posts on the forum on fitting such a thing.
The only changes I would make to his faceting head is making the quill from a collet chuck and collet, (in picture) way beyond any sort of accuracy you can get from boring holes and also buying an index wheel.

Thanks Frank,if you ever want to add an encoder to your machine let me know :)

7
Gemstone Faceting / Re: MB concave build
« on: October 04, 2019, 12:02:12 PM »
Hi Flash,
With the gemmasta as soon as I lift/lower the mast height on the pole I have to re align I don't think the linear bearing will help. In the future I'm thinking a new facteting head, with linear height adjustment and on a slide.
With the gemmasta when doing steps, I thinking of pulling the handpiece off and making an allignment tool that goes on the shaft the handpices comes off, this will match up with another alignment tool in the concave machine collet.
I have ideas for alignment tools that will work a little different to what Ultratech does.The other possibility is using a hard stop and aligning against that after changing height.
Cheers
Andrew

8
Gemstone Faceting / Re: MB concave build
« on: October 03, 2019, 07:38:51 PM »
Hi flash, I am adding horizontal fine adjustment. I am thinking of using an alignment plate that goes in the collet, then adjusting horizonally. I will not have z axis adjustment atm(other than a bit from the oscillation carrage). I need a new faceting head/mast that is on a slide.

9
General Discussion / Re: Help in identifying lapidary equipment
« on: October 03, 2019, 05:20:52 PM »
Just the faceting machine is worth a $1000 and that's a cheap price. Looks like a saw and lots of stuff. I wouldn't worry about missing stuff just buy it all as you have a bargain imo. If you decide you don't want the faceting machine put it on ebay with $1000 starting bid, it will go for more imo.

10
General Discussion / Re: Help in identifying lapidary equipment
« on: October 03, 2019, 01:10:50 PM »
A lot of equipment there, very good buying at $1000 imo.

11
Gemstone Faceting / Re: MB concave build
« on: October 03, 2019, 09:31:40 AM »
Looks a seriously cool rig, seen a couple of custom ones and a friend had his at the AFG meet. Do you think the lock up plates will be enough to stop the quill flex?

The two I've seen use a lateral stop system beside the quill, one had a fine adjustment on it and being hard against the quill there was zero flex when cutting. Both machines allowed the quill to move vertically and the quill was held firmly against the stop when cutting.
Thanks, it locks the pivot solid. I think it should be ok without the stop, I'll find out anyway. A slight bit of flex might be helpful cheating when polishing. :)

12
General Discussion / Re: Testing testing
« on: October 02, 2019, 01:26:38 PM »
Well done Frank that would be one of the best home made machines I've seen.
I have slowing be designing a machine myself. What did you use as the mast, I was going to use 40mm aluminum square bar?
CheerMB

13
General Discussion / Re: Testing testing
« on: October 01, 2019, 08:26:31 PM »
 :) What sort of machine is that Frank?

14
Gemstone Faceting / Re: MB concave build
« on: October 01, 2019, 10:53:01 AM »
Cool, I'll have a play in it.
You certainly like the harder to cut designs :), great to hear Supernova is nice in CZ.
How is your encoder going?, send it down if you want and I'll get it going and write some basic code you can work with.
CheersMB

15
General Discussion / Re: Testing testing
« on: October 01, 2019, 10:02:22 AM »
Hi Frank,
Below your picture where it says image linking codes. Pick one that best suits, click in the box containing code, CTRL A(sellect all), CTRL C, then CTRL V into your post.
I usually use "BB Medium Image Code".


CheersMB

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