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I am writing a vlisp program to read the dimension entities in a drawing and write them to a text file. I use ssget to get the dims, then use entget and assoc 42 inside a while loop to read & write the dims. The program works fine for reading the basic dimensions. But the tolerances are not...

I need to write a VLISP routine which will load a graphic image (.wmf) in the ACAD graphics screen and then move this object relative to an open drawing. Please help me with answers to the following: 1) what are the different ways to load an image without its associated frame? 2)Is there any...

It is Tungsten and not Tungsten-Carbide. Thanks guys, for giving me a start. Shall try with "Tungsten-Carbide" tools and let you know. regards rakes

We have a requirement to machine (Turning) Tungsten. Has anybody in this forum machined Tungsten? If so, I'll be grateful if you can share your experience with me.

Is there a standard to be used when specifying bolt holes for metric screw threads? For example do I specify a hole dia of 6.3mm, 6.4mm or 6.5mm for assembling M6 coarse thread bolts? Does anybody know where I can get this information?

Thanks guys. But I've a question for moldcore. Tell me how does Al. load up the filters more than other metals? I presume 10 or 20 micron filters are used in EDM machines. So for the filters to get loaded up, Al has to produce larger size residues. If this is true, is there any method of...

There is a lot of speculation about EDMing Al.Alloys. Shop floors resist doing EDM on Al.Alloys citing reasons of filter damage etc. Can somebody throw some light into this?

Are all non-linear interpolation schemes (like circular, helical, NURBS, etc) approximated with lines by all CNC controls? For example, a circle by means of several chords so that linear interpolation can be done internally to approximate the circle within some tolerance limits? Are NURBS curves...

we are planning to retrofit our old Vertical Turn-Mill with Siemens 840D. The mill spindle of this machine gives only 1000 RPM (max) and so we have a problem with cutting speeds (and feeds). We would like to replace this with a full CNC B-axis add-on to the spindle. This accessory is made by...

We are machining lot of AA2014 & 2024 Aluminium Alloys in our CNC mills - but at spindle speeds less than 5000RPM and with flood coolant. We are planning to procure a high spped spindle attachment for speeding up production. Has anybody machined these alloys using high speed cutting? If so at...

Mail a sample program along with list of G&M codes to me. I can help you get started. Hope your machine is a 3-axis mill. esrakesh@rediffmail.com rakes

Try http://www.cncci.com/ They have all the courses you need Hope it helps best of luck rakes

What is the repeatability assured by AT3 class tooling? What are the other standards in vogue regarding tooling for CNC Machines. Is there anyhting better than AT3? Thanks rakes

We have done upto 0.4mm holes in Ti6Al4V. Remember that Titanium has poor thermal conductivity and is work hardening. Solid carbide drills work best but if L/D ratio is high, then it is better to try HSS-Co with TCN coating (to avoid breakage of drills). In any case, drill run-out should be...

First thing you ask is the grain size. Micro-grain carbide tools retain their edge better under adverse conditions. Transverse rupture strength (for solid carbide tools) is another parameter. But the best way is to get a sample and cut it on your material. Nothing like seeing it with your own...

Thanks for the help, guys. Striker's routine was able to do the job better indeed. But tell me, what's the difference between a simple "text" command and a "._text". Thanks once again to CarlB & Striker for the help. rakes

I am writing an AutoLISP program to read a text file and write the whole text on to AutoCAD graphics screen exactly as it would've appeared in the text file. Here is the code: (setq f1 (open f_name "r")) (setq str 1) (setq block (read-line f1)) (while (/= str nil) (setq...

We are in the process of evaluating CNC machine-tools in terms of its positioning accuracy and repeatability. Unfortunately different manufacturers quote different standards like VDI/DGQ 3441, DIN/ISO 230-2 97 etc. Can anyone tell me or point me to a web site where I can have a look at how these...

Thanks guys. The problem was exactly what CarlB pointed. Thanks very much for the help.

I am writing a program in AutoLISP which reads geometry created in AutoCAD and processes information regarding start point of line etc, for output to a file. my problem is in using "=" function. I read start angle of an arc using "entget" and "assoc" functions. But...