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How do you estimate / quote programming times?

hoju6886
Hey, all!

I am looking for a very simple answer to a very complicated question. I have a TON of work ahead of me and my boss wants to know how long it will take to complete.

I have a very broad spectrum of parts that are all quite different from each other. I have heard that a general rule of thumb is you can apply "five minutes per touch". I have, at the end of a program, counted how many touches the CMM takes, and I can look at how long it took to me to program the part, and this rule of thumb, isn't that far off.

The problem is BEFORE programming, or putting in too much work, I would like a quick and easy method to arrive at a ballpark guess at programming time. I have lots of experience, and I can look at a part and give a ballpark estimate, but my boss wants a layman or someone who is not a CMM programmer to be able to look at a model of a part, and by feature count or some other metric, be able to determine how long it would take a CMM programmer to write a program. (approx.)

Anyone out there know a trick or rule of thumb that could help me out here? Thanks in advance!

TheWhiteSpider
PC-DMIS 2013
offline CAD++
NX/Unigraphics into .IGES files
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  • I do all my programming offline and I always try to have a really fleshed out idea of the set-up before hand. I try to spend all my time up front, so when we get the actual part in our hands, we don't spend too much time on the proveout.

    Typically, I will go through a print, however many pages, and highlight what I think can go on the CMM and what can't, and what I will try to get, and all the datum features. From there, I can usually make a pretty good guess how long it will take, (then I double it! ;-) ) But, I guess AndersI has the right idea.



    The trick is, my boss or someone ELSE would like to look at the feature count or dimension count, and come up with a ballpark programming estimate.

    Thanks!

    WAIT!!!..........there are points on a print that can't go on the CMM Program??.....??.....I get asked to write PPAP programs where the print has been marked and EVERY single dimension is numbered. This is done on the portage table (round table), and can be done. But I try to explain that some of these features do not apply to the CMM....but no....I have to find a way..

    And this is only when the supervisor is mad because I proved him wrong on something, so my "punishment" is writing a PPAP program....LOL
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  • I do all my programming offline and I always try to have a really fleshed out idea of the set-up before hand. I try to spend all my time up front, so when we get the actual part in our hands, we don't spend too much time on the proveout.

    Typically, I will go through a print, however many pages, and highlight what I think can go on the CMM and what can't, and what I will try to get, and all the datum features. From there, I can usually make a pretty good guess how long it will take, (then I double it! ;-) ) But, I guess AndersI has the right idea.



    The trick is, my boss or someone ELSE would like to look at the feature count or dimension count, and come up with a ballpark programming estimate.

    Thanks!

    WAIT!!!..........there are points on a print that can't go on the CMM Program??.....??.....I get asked to write PPAP programs where the print has been marked and EVERY single dimension is numbered. This is done on the portage table (round table), and can be done. But I try to explain that some of these features do not apply to the CMM....but no....I have to find a way..

    And this is only when the supervisor is mad because I proved him wrong on something, so my "punishment" is writing a PPAP program....LOL
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