Tried the stained glass technique.
Not succeeded yet as cannot see the stained glass effect.
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I almost forgot the new machine
Playing around with some other machines in last few months.
One of them.
Auto Guiding Sky Tracker
Just amazing work! Incredible stuff!
cheers, Ian
It's rumoured that everytime someone buys a TB6560 based board, an engineer cries!
Just made a test on the reliability of the machine.
25,000 0.25mm holes are drilled on a goose egg shell.
No drill breakage :banana:
But the hole position started to deteriorate after the first 1000 holes of a new drill bit.
The flute length of the 0.25mm drill bit is 4mm.
And from the photo, it can be found that the hole shift is up to 0.2mm approximately.
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OK, the holes shifted - but why?
I seriously doubt that the drill tip wandered that much: the drill would have snapped. (0.2 mm wander on a 0.25 mm bit?) Although it might have wandered a bit, as some of the hole spacings are very erratic.
Perhaps the drill bit was getting a bit blunt? To be sure, egg shell is not hard stuff, but it could still be abrasive.
Did the A axis start to lose pulses or something?
Did the mathematics have round-off errors?
Did the surface sensing have some hiccups?
Did the egg surface make the drill bit skate around? (Possible, possible, especially if the drill bit was getting blunt.)
Could you repeat the exercise but once the holes start to seriously wander, change the drill bit for a new one?
Fascinating stuff.
Cheers
Roger
I seriously doubt that the drill tip wandered that much: the drill would have snapped. (0.2 mm wander on a 0.25 mm bit?) Although it might have wandered a bit, as some of the hole spacings are very erratic.
[Studied the enlarged photo again, I guess the wandering may be a bit less than 0.2. But should be up to 0.15.]
[Look like tungsten carbide still gets some degree of flexibility.]
Perhaps the drill bit was getting a bit blunt? To be sure, egg shell is not hard stuff, but it could still be abrasive.
[Two new drill bits have been used. calcium carbonate is sure a kind of abrasive material ]
Did the A axis start to lose pulses or something?
[I guess not, as each hole circle can be closed.]
Did the mathematics have round-off errors?
[Excel worksheet is used, without round-off.]
Did the surface sensing have some hiccups?
[Surface sensing affects the hole depth only.]
Did the egg surface make the drill bit skate around? (Possible, possible, especially if the drill bit was getting blunt.)o
[Blunting should be the cause. You can see the true position of the holes are good when the hole count is below 1000.]
[And it started to deteriorate significantly. I used two drill bits for this drilling. One for about 12,500 holes.]
[You can find two shadow areas. They are where the 1000 holes areas for the two drill bits.]
[In these shadow areas, the true position of the holes are good.]
[On the other hand, the sound is very different. When the drill is new, the sound of the cutting is sharp and clear.]
[But very soon, it became very dull. Just not like cutting, but punching]
Could you repeat the exercise but once the holes start to seriously wander, change the drill bit for a new one?
[I tested a 18,000 hole pattern before by using 0.3mm drill bit. Same result.]
[I'm not surprised by this result. I have worked before in a PCB shop. We change new drill bit for each 1500 holes for 0.25mm drill.]
[Of course, much difficult material - glass fiber reinforced epoxy]
Hi uvvvvw
OK, blunting and skating it must be.
You know, I am not sure that FRE is more difficult than eggshell. Thing is, I suspect you can get inclusions in the eggshell - stuff like tiny bits of quartz (sand), and silica is highly abrasive.
Ah well, next stop would be a diamond-coated drill bit, and after that maybe a laser?
Apropos of nothing, I believe that some grades of aluminium can also be seriously abrasive: tiny inclusions of aluminium oxide get thru. Nothing like trying to drill AlOx!
Cheers
Roger
Tried the stained glass technique again.
Some improvement. Can see the stained glass effect now
Still need more practice to improve the thickness distribution of the ink.
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My first ostrich egg shell, for new machine testing
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Tried to carve the pumpkin for Halloween
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Light bulb
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Are you for real??? Engraving on the surface of a light bulb???
Blimey!
Or is it more of a 'frosting'?
Cheers
Roger
PS: how many did you break first?
OK, I grovel.
Cheers
Roger
PS: Free-range hen eggs next?
thx Mac. and yes, it is the new machine for the ostrich egg.
This time, a candescent lamp bulb.
A bit pushing the limit
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