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Messages - John S

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91
General Mach Discussion / Re: Jog problems with Mach2 Mill
« on: August 01, 2006, 04:34:09 PM »
Check on the TAB jog screen that you haven't got a low feed rate entered and in step mode at the same time.
I have had this.

John S.

92
Show"N"Tell ( Your Machines) / Re: John S Seig X3 conversion
« on: July 28, 2006, 08:50:00 AM »
Brian,
Crap answer :D
It's running Mach3 latest release.
Bit of extra tuning this morning and it's capable of 5 meters per min or nearly 200 in/min
Rather scary for a little machine. Just wanted to see how fast it would go to workout the safety factor on missed steps when it's set to a workable 1.5m/min or 60in/min

John S.

93
Show"N"Tell ( Your Machines) / Re: John S Seig X3 conversion
« on: July 27, 2006, 07:54:40 AM »
Up to the test running stage now.

http://homepage.ntlworld.com/stevenson.engineers/lsteve/X3/DSCF0437.AVI

4.5 meg for those on dialup.

4th axis done just limit switches and a bit of tidying.

John S.

94
General Mach Discussion / Re: Sorry I am out
« on: July 23, 2006, 06:05:37 AM »
If it's a boy are you going to call it Art or Mach ?

John S.

95
General Mach Discussion / Re: Toolpath Screen
« on: July 16, 2006, 06:22:53 AM »
Nearly right.
It's not the distance but the Arc's that want swapping over form Abs to INc or the other way depending on what they are now.
Very common problem.

John S.

96
Show"N"Tell ( Your Machines) / Re: Brian's Emco Compact 5 Retro
« on: July 11, 2006, 06:55:06 PM »
Arturo,
This wasn't touted as a replacement for Brian's tool changer but more for a conversion of a centre lathe to CNC.
This also answer Bloy's question in the same post, these are off the shelf units, made in Italy to quite a high standard and available in a number of ratio's.
As an idea these cost about 80 UKP each, new.

You couldn't make one for the price given hardened worm, bronze wheel and 4 bearings. I have had one of Brian's tool changers in pieces and they are crudely made.
There is tons of backlash in the worm and wheel, in fact it's a gear not a worm, and it relies heavily on being driven backwards against the pawl

My idea was to take one of these, fit a stepper and a large top hatted disk, the smaller diameter to fit inside the final drive worm and the larger diameter disk to carry 6 or 8 tools.
On the rear of the disk would be machined 6 or 8 ratchet teeth for a pawl to lock into.

97
Show"N"Tell ( Your Machines) / Re: Brian's Emco Compact 5 Retro
« on: July 11, 2006, 08:59:27 AM »
I am thinking about doing this in a plugin... I could make a dialog that would do about any toolchanger :) I hope to started that after I get the project that I am working on now done :(

This is going to be a good year!
Brian

Once the craps out the way :D

How about this for an off the shelf toolchanger ?


The bore is a thru bore with keyway, just right for accepting a backplate for tools.
Ignore the chuck it's just posed there for show as a 4th axis on a small mill.

John S.

98
Show"N"Tell ( Your Machines) / Re: John S Seig X3 conversion
« on: July 10, 2006, 05:02:55 PM »
You have to when you are limited by the tools :D

John S.

BTW, did you see the error message I posted on Yahoo.
Bolt circle is still broken, post code comes up with a syntax error

99
Show"N"Tell ( Your Machines) / John S Seig X3 conversion
« on: July 10, 2006, 02:56:41 PM »
Part way through a conversion of the Seig X3 mill.
Many have done this using the original brackets but I wanted to get it as compact as possible. I think they look horrible when they look like Prince Charles :D



Shows both axis with motors fitted, X still needs the rear shaft shortening.



Start of converting the Z mounting, drive will be by HTD belt at 5mm pitch.



Ballscrews are by NSK supported on matched pairs of angular contact bearings driving thru Oldham couplings.

Still a lot to do, some things are unfinished like no X screw fitted at present although all the parts have been made.

John S.

100
General Mach Discussion / Re: Series1 Bridgeport CNC retro
« on: April 28, 2006, 08:06:28 AM »
Robin,
Is that one of the larger Arc Euro motors on the Z ?
If so how did you extend the shaft to take the timing belt pulley? I have to do this to my old servo MDI machine.

Is that a G-Rex in the cabinet ?

John S.

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