calculate mechanical quotas parts

[bip]

Surely I can tell you that in the everyday life of the brianzole workshops you do that much to the piece.... similar prices but never equal, even on identical piece made by the same workshop...so they do not follow scientific methods of calculation.

I can tell you for certain that more than one workshop of your area (mb) makes quotes of pieces that at every revision of the design you require, the price increases at least 10% even if the piece actually requires the same processing (maybe you move slightly a hole) or even, you remove a processing, but still the price increases.
Obviously when you ask for the quote, the price is not given purely by the processing and material, but there is also a "commercial" aspect behind.

 

[meccanicamg]

I can tell you for certain that more than one workshop of your area (mb) makes quotes of pieces that at every revision of the design you require, the price increases at least 10% even if the piece actually requires the same processing (maybe you move slightly a hole) or even, you remove a processing, but still the price increases.
Obviously when you ask for the quote, the price is not given purely by the processing and material, but there is also a "commercial" aspect behind.

Of course..... just that those who are honest become the supplier of big companies, while those who do not do the right price, at least from us, are put out of play....unless they... have a holy protector in the company.

 

[PIETRO2002]

Of course..... just that those who are honest become the supplier of big companies, while those who do not do the right price, at least from us, are put out of play....unless they... have a holy protector in the company.

It is always worth at least three quotes, but not always the lowest price is the best, in the end you have to trust some companies and proceed with those... then every now and then remake the round of quotes to tastare the wrist of the market.

 

[stevie]

do you propose your method of calculation?

There is no standard method, variables are too many, not least psycho-economic.
if one is unloaded work will accept to work unless to make the machines turn.

 

[bip]

Of course..... just that those who are honest become the supplier of big companies, while those who do not do the right price, at least from us, are put out of play....unless they... have a holy protector in the company.

simply, as stevie says, the estimates made by a third party not only represent the cost of achieving such component, but there are also many other aspects, such as the commercial one (price discounted to establish a relationship) or the working period.

here explained - together with what I wrote before- as never the same component, made by the same third party, may have slightly different prices depending on the period. .

 

[bip]

a factor that makes it even more difficult to calculate the price of a finished product in a "fast" way from the design are the tolerances, if they are particularly narrow and risk of having to discard some pieces, the cost rises, but at the level of "drawing" the price is always that, if you estimate the cost according to the removed volume of machine tool, you can not always estimate how many problems then you will have when you really have to realize that component.
Sure, in the design phase, when you have to choose between two solutions and you would need to know what comes to cost less, a "simple" system would be useful, in my opinion if you have a good relationship with the supplier, you can afford to ask him to make a precise estimate of the cost of the components of both solutions.. ..in the same way, since the supplier is available to make quotes of pieces that already knows that it will not realize (at least one of the two solutions will be rejected), for correctness, will be recognized a greater margin on the order, without turning to another supplier only because it makes a slightly lower price.

In my opinion, a lasting working relationship is also based on mutual trust and fairness

 

[cnconline]

hello to all

are cristian of cnconline.info


the calculation of the cost of the component, as specified by many users, is quite complex
in cnconline we tried to automate it and automate it as much as possible
basically there are two classes of components; those with complex surfaces (double curvature) and not
the cost of the material can affect a lot, both in terms of raw material and in terms of milling time/rounding
even placements can influence significantly, just think of the masking needed in the absence of centring points.

in the case of complex surfaces (stamps) the surface finish determines the number of passes with the spherical head tool, and therefore the big of the finishing time
accuracy typically defines itself with the colors of the faces in the .step file
the presence of small connection rays implies the removal of the residual material with additional low past "feed" (just think of a radius 1mm, perhaps a alloy steel)

the holes generally do not affect much, except where the material is difficult to process and/or small mating (e.g. a mating m1 on aisi304), or the processing is very deep

Finally there is the cost of the cam program, which comes into play at the first execution or in case of revisions

estimate the cost of the cam program is not simple. the easiest way is to analyze how many operations are needed
the tool path can be rough or optimized; think about when the mill takes away a variable volume of material, if the progress is constant there will inevitably be lost times, or excessive stress on the tool

with the cnconline portal we have developed 3 possible approaches:
calculation of emptying
calculation of processing phases
the generation of the cam program