opinion on estimates for turning

[Ælindor]

Hello everyone,
I am a restorer who mainly deals with statues of the early 900.
very often lack components, which I have to recreate through fusions, others require turning.
Having familiarity with 3d modeling software having a background in architecture, I always found it convenient to model the components and then commission the production on pcbway.
I need speed lately and I can't wait for the timing of the latter, so I'm turning to on-site turning machines, using traditional lathes.
the pieces that often require me are single, the material is brass and no extreme precision is required because they do not have mechanical purposes.
I would like to be able to evaluate in an analytical way the estimates that they give me, since I find them quite inflated.
people in the industry tell me that the operating hand is usually 30€/h + one-time costs + depreciation.
I would like to know your, attached the file I submitted to the lathers, I would like to understand what would be an honest quote according to your opinion, then I share with you the quotes received.
consider that:
-The material is brass
-Extreme precision is not required, there may be a difference even of 1-2mm.
-the finish is not required, the raw piece is also fine.
thanks to all

 

[MassiVonWeizen]

leaving the quality of the design, if you write 30,04 without specifying tolerance and roughness the estimate will be adequate to what read on the design i.e. to a piece with centesimal dimensions that rightly requires equipment to build and measure it that have a higher cost to the lathe and the caliber of the brico in addition to the competence of the operator

 

[Ælindor]

leaving the quality of the design, if you write 30,04 without specifying tolerance and roughness the estimate will be adequate to what read on the design i.e. to a piece with centesimal dimensions that rightly requires equipment to build and measure it that have a higher cost to the lathe and the caliber of the brico in addition to the competence of the operator

Hello Mass, thank you for the answer, but did you read the post? because I have written 2 times that tolerances are high, they do not have mechanical purposes.
I drew the piece with decimals because the original is so, but it is absolutely not required

 

[MassiVonWeizen]

where is it written that tolerances are high? What does it mean high?
you could round the decimals having familiarity with cad 3d.

 

[DrBarde]

If you send such a drawing to a supplier it is obvious that you use those centesimal tolerances. She put her in a hundredth grade.

otherwise for each design must go to talk to the company specifying what the tolerances to which it must stick, since it has not put them in the drawing. and rather than doing such a job, perhaps, is the case of making a just decent technical table.

 

[Ælindor]

in the post I specified 2 times the tolerances, as I specified to the lathers this essential information. Of course you are right, the boards could be clearer, it is not my profession that of the designer, but the lathers from that point of view never had problems of interpretation.
in any case I will take your advice to improve even the designs, but this is not the focus of the post

 

[Chris_BRB]

Regardless of what you tell the lathers, what makes faith is the design. round tolerances if they are not important and indicate a roughness value depending on the necessary finish (a high degree also 6.3 could go I seem to understand). also indicates the rules for general tolerances to be referred to in the cartilage.
with these small short notices surely the price will fall.

 

[Ælindor]

Regardless of what you tell the lathers, what makes faith is the design. round tolerances if they are not important and indicate a roughness value depending on the necessary finish (a high degree also 6.3 could go I seem to understand). also indicates the rules for general tolerances to be referred to in the cartilage.
with these small short notices surely the price will fall.

thanks for the valuable information

 

[TETRASTORE]

first you need to know whether the material you provide it or you have to think about the supplier; in the second case or find a turning pointer that already has brass bars and can ask you a few euros, or you have to get it and a piece of 30 mm long diameter bar 200 mm can cost also 30 €.
the processing of a single piece is preferable to make it manually on a parallel lathe and with a operator that has a minimum of manual handling. the hourly cost of 30.00 € is honest but depends on the final price you will be made based on the time dedicated to this activity that may vary a lot from subject to subject.
in my opinion a lather could also ask you 100 € per piece single material included.

 

[Ælindor]

first you need to know whether the material you provide it or you have to think about the supplier; in the second case or find a turning pointer that already has brass bars and can ask you a few euros, or you have to get it and a piece of 30 mm long diameter bar 200 mm can cost also 30 €.
the processing of a single piece is preferable to make it manually on a parallel lathe and with a operator that has a minimum of manual handling. the hourly cost of 30.00 € is honest but depends on the final price you will be made based on the time dedicated to this activity that may vary a lot from subject to subject.
in my opinion a lather could also ask you 100 € per piece single material included.

thanks for the information, have you predicted about 2h processing?

 

[TETRASTORE]

the actual working time will be about half an hour but for one piece you are strongly penalized.

 

[Ælindor]

the actual working time will be about half an hour but for one piece you are strongly penalized.

Thanks again, that was exactly what I wanted to know

 

[DrBarde]

I tried to see, I would say it is a range from 90€ to 150€ depending on the situation, including material.
in line with what was said by the transtor.
If you could do it in aluminum maybe save a little something.

 

[Ælindor]

I tried to see, I would say it is a range from 90€ to 150€ depending on the situation, including material.
in line with what was said by the transtor.
If you could do it in aluminum maybe save a little something.

Can I ask you how you got this?

 

[DrBarde]

Can I ask you how you got this?

using some sites that allow to make a calculation for prototyping, from private also.

if you look for search engines find some, there are a couple that besides 3d printing offer cnc service.

 

[Ælindor]

using some sites that allow to make a calculation for prototyping, from private also.

if you look for search engines find some, there are a couple that besides 3d printing offer cnc service.

the quotation of this piece, with pcbway was about 40€+ shipping

 

[DrBarde]

I used a service of an Italian company (sede in veneto) and was on the line of what was said.
At least it is realistic with the area evaluating the costs in our nation, at least in my naivety I thought this.

 

[Ælindor]

I used a service of an Italian company (sede in veneto) and was on the line of what was said.
At least it is realistic with the area evaluating the costs in our nation, at least in my naivety I thought this.

I share what you say, but I would do an average in my opinion. because these sites generate a quotation I imagine using cnc lathes and do not turn parallel, then second they dissuade the creation of individual pieces raising the barrier of the initial price

 

[MFT]

I share what you say, but I would do an average in my opinion. because these sites generate a quotation I imagine using cnc lathes and do not turn parallel, then second they dissuade the creation of individual pieces raising the barrier of the initial price

since they are pieces without great dimensional claims, but you rated to buy a small manual lathe used and try to build them. small hand lathes are found and at affordable prices.

 

[Ælindor]

since they are pieces without great dimensional claims, but you rated to buy a small manual lathe used and try to build them. small hand lathes are found and at affordable prices.

Of course, I think it will be one of the next important purchases, unfortunately I don't have much room in the lab, I think I will take this step when I expand the spaces.
In any case I would like to collaborate with professionals otherwise all processing falls on me.. I would like to distribute the workload and also reduce the timing