| Gallery, Projects and General > How do I?? |
| Rotary Table - another dumb question... |
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| AdeV:
....how _do_ I set one up on the mill, so I know exactly where the centre of the rotab is in relation to the spindle centre? I have at my disposal: A regular DTI, a finger type DTI, and a small quantity of patience... basically, I'd like to know when I'm plumb above the middle of the rotab with the cutter, so when I offset by X, I know i'm now cutting a circle with radius X (assuming the work is also centred on the rotary table). However, this leads to my next question, along similar lines; I need to cut a curved section out of a piece of work (see the attached "metallic 3D" Crap-o-Cad). I don't (yet) know the radius but I'm hoping it'll fit on the rotary table, let's assume it's 8" & my rotab is 12". What's the easiest way of setting the block up so that it'll cut the desired 8" radius? I'm thinking, once I've got the rotab centered, dial 8" of X-axis offset, and with a centre point tool, locate the block square on the table with the pointer pointing at the line, then simply fettling until it follows the right course. However, whilst that should certainly work for my purposes, it doesn't seem like a terribly accurate way of doing things; Surely there must be a better (more accurate) way? |
| Darren:
To centre up the RT put your finger dial in the mills spindle and rotate it around the RT centre hole or fitting if you have one. Then move the x or y axis by the arc you wish to make radius. Hope that makes sense? |
| AdeV:
Hi Darren, Yep - I think so - I presume the dial should read the same wherever it's rotated to; I did try that a while back, but got all screwed up trying to work out offsets & other things, 'cos the finger isn't the dead centre.... I have got a central spindle in my rotab which I can use for this purpose. Annoyingly, a 3MT dead centre just drops through the hole, so I can't use it to centre by eye to another point... Shame, because it strikes me that if you could stick a dead centre in, then have an "inverted point" edge finder (i.e instead of a sticky-outy-point, it had a sticky-inny-point), you could centre a rotary table in a matter of seconds.... Reckon I just found me another project... :proj: |
| krv3000:
HI right sos for spelling but dus the mill have digitel reed out ? as described put your finger dti in the mill and clock in the center of the rotary tabel set the dro to 0 on bothe the X and Y then from the center move the mill tabell out to the desierd radius then reset the dro back to 0 clamp up the work up sqer ones you have dun that move the mill tabel past your radius then start cuting moving the mill tabel in till you get the dro reeding 0 hope you can folow that :D |
| No1_sonuk:
You probably need a spinning-type edge finder. :thumbup: |
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