/diy/ - Do It Yourself

would making it in this orientation have any advantage other than gravity can now be used to apply pressure to the master, rather than a spring or something in the op image.

>>2845408
Cnc is better

>>2845597
to use CNC i need:
>programming
>3D CAD
>g-code
>functional modern PC
>if i build a CNC machine i must make it so it can interface with the above
pantograph:
>clay and some basic sculpting tools.
>a dial gauge (already have this)

>>2845646
Look for a pantograph engraver machine on your local craigslist or facespace marketplace. There was even one near me not too long ago and I live in the middle of an industrial machinery desert. They usually don't go for a whole lot since no-one really wants them or uses them much.

>>2845683
>/diy/
>just buy it bro!
anon, come on.
also there's a problem with that, which is why i want to build my own;
they don't have the right axis. the only ones i have seen for sale have x and z, that is forwards and backwards and left right, not y; up down. meaning they can only do 2D engravings, not engravings with depth like relief on a coin.

>>2845777
You obviously have no fucking clue what you're talking about... Deckel pantograph machines as well as others can easily do 3 dimensional objects.

But yeah instead of saving old iron from the scrapyard and fixing it back up for use, go ahead and build some scabbed together bullshit so we can all sit back and laugh at your retardedness.

>>2845805
you obviously have no fucking reading comprehension

>>2845408
i haven't looked through your design too closely but i made one that attaches to my milling machine spindle following the plans on joe pie's website. $10 or 20 for the plans and a couple bucks for aluminum drops on ebay, not too bad. it's only a 2D pantograph though, some of the deep and varying depth impressions in the coin dies might need 3D

>>2845829
He did say though that by adding a vertical pivot in the block the attaches to the mill spindle, you could likely make it 3D (though with a very limited Z up/down travel)

>>2845829
>>2845830
Here it is copying a diamond pattern off an old file into a test blank. Later copied it to a D2 die block

>>2845831
yeah, very nice, but i need up/down. so i'm going to make the "table" (i don't know the names for all these parts, do they even have names? i am deciding the names now)
the table, it will rotate, like >>2845413
the two tables will be linked mechanically to always have the same orientation, if one slips in relation to the other, the engraving would be scrapped off.
what did you use for the engraver there? rpm?

>>2845832
I guess I can't see how the arms in your designs relate to the arms in a typical pantograph (2D or 3D), which by design contain similar triangles which force the engraving bit to trace what the stylus does at some fixed reduction of size (or increase in size). I can see how this straight-single-bar design could have a pivot at the other end allowing for vertical contours to be traced, I just don't see the horizontal fixed-ratio similar triangles.

I used a pneumatic die grinder with single flute carbide engraving bits (60 and 30 degree) available on mcmaster carr. the die grinder is a Sioux model, I think the 5978a pencil grinder

>>2845870
Oh I'm being dumb, I guess I see how the mechanically linked rotation allows for only 1-to-1 copying in 2D all by itself? And then the stylus/engraver bit move together as one within each disk/table. If 1-to-1 only is fine for you then that makes sense, although tying the rotation of two disks together seems mechanically tougher to me than modifying a 2-bar linkage (the typical 2D pantograph) to have a pivot for 3D designs.

>>2845870
>>2845875
there's no triangles in a coin pantograph :) reduction is done by a single arm like a "lever". where the lever moves say 5 feet at the very end, 90% of the way towards the pivot point, it will move 10% of that, so 6 inches. thus a reduction of 10:1 can be achieved. it pivots both up and down and left and right but the left and right motion is guided by a threaded rod, and moves very slowly like a record player.
my research reveals that a rough cut was done before a final pass, sometimes taking 2 days !?!?!?! pretty sure you could get a good finish in an hour or two. but we shall see.
I've drawn up a lot of plans now.
I am tempted to cannibalize a broken old drill press I have but I may not need to.
>>2845875
>tying the rotation of two disks together seems mechanically tougher
not at all, my plan for the rotating tables is to use a lathe chuck for each one, engraver and follower will be adjustable in height too. the chucks mounted on a spindle will go to a drive gear, then an arm on each spindle, exactly the same length, linked by a rod. that should keep them in perfect alignment. pic rel. quick drawing of what i mean.

also I've got a really nice piece of steel I plan to use for the main arm. where the follower and reduction will be mounted I can't foresee any other long part that would need to be precision. It's a piece of flat bar stock but it's not your average shite mild steel, it's something nicer, very square and straight, very good quality, 10mm thick, 50mm wide, just over 1200mm long if needed I can extend it beyond the working area with a lesser steel. but I feel like this will be enough, if I wanted to make a 45mm diameter coin (average for collectors) i could make the master 270mm wide, have a reduction of 6, and the engraver would only need to be at 200mm from the pivot. correct my maths if i'm wrong. I can use a small lathe chuck and probably get the engraver way closer to the pivot than that.
I think they used about that much reduction on the royal mint ones.

>pantograph for coin dies

I like the "WE ARE ONE" on the old penny, things behind the scenes you don't think about.

>>2846045
>MIND YOUR BUSINESS
That used to mean "work hard"
As in "mind your work and work diligently"
Now it means "leave me the fuck alone!" in America.
Maybe so you can pretend to work while you get paid instead.

Wannabe mint anon from biz. Absolutely epic, Proton Me style@ warosuba not knowledgable on diy but can discuss

One thing I am thinking about, wondering if anyone can chime in; rough pass, then finishing pass.
I will need a place or method to "zero" the cutter and follower, i think i can do this on the edge of the die if i set a flat area on each the master and die intended to be at the level of the blank die material. should i use a blunter follower for the rough pass? and a wider bit in the engraver?
>>2846074
email sent, let me know if you get it.

a little further research: the secret ingredient for the high quality results of the janvier pantograph was changing the feed, that's what those two big cones do, as the engraver progresses along the die it changes the rate of rotation to keep the feed rate the same. I think this can be achieved more easily electronically. simply changing the speed of the engraver should do the same thing.
mitigating vibration is also really important. I'm not sure if it would help to have some kind of damper on the arm or if this would simply diminish and nullify any fine detail.

>>2845419
are ball-joints or 3-axis pivots like that the best way to go? i know matthias wandel used a 4-bar linkage for the x and y axes, i bet it would be much more rigid that way. i think he used a single hinge for z, but maybe it was another parallel mechanism

for small stamping dies, would it not be easier to have a cutter (e.g. mill spindle with carbide/hss tooling) be stationary, while the small blank is moved by the pantograph?

>>2846533
mate, i think you are missing something
the die is rotated. the cutter moves left/right and up/down. like a record player
this gives you the 3 axis of movement and 3D engravings.
to make the die move on one more axis, while rotating, is more difficult and basically a CNC at that point.

>>2846538
why is the die rotated

>>2848746
because that is how it works, look up a video of one