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Subject: Re: How to figure 4th axis feedrates?

Date: 06/10/02 at 5:26 PM
Posted by: Sam
E-mail: ehrichwebster@bluefrognet.net
Message Posted:

In Reply to: Re: How to figure 4th axis feedrates? posted by Neal on 06/10/02 at 10:25 AM:

I think I've got it. Essentially what I'm doing for a combined rotary and linear move is telling the indexer how fast to rotate(only). The linear axis is then sychronized to the rotary to make a straight move. This eliminates having to worry about different diameters on the indexer. I just need to figure out how long my move actually is, over what total angle, the feedrate I want to cut at, apply the formula, and the indexer will rotate at that speed. The linear axis will then sychronize itself to the indexer. That's not bad! So if I'm rotating only 5 degrees, but moving over 5" linearly, the indexer will be moving very slow. Conversly, if I'm rotating 20 degrees, but only moving over .05", the linear axis will be moving very slow.
Now my only question is: Is there generally a different letter than F for this type of movement? I'm thinking there isn't, if an index move is combined with a linear move the degrees per minute automatically applies. Am I right?? If so, Neal, you are a genius! Thank you.
By the way, I've read some of your other posts and detected a certain annoyance at the general lack of good questions. Can you recomend any other good message boards or good machining websites? There seems to be a definite lack on the web in my searchings.

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