overall interpretation "cutting tool"

[ValveFloyd]

Good morning to all,
I am a student of the first year of mechanical engineering and I am preparing the drawing exam. I am encapsulated in this overall on which I have several doubts. I ask that unfortunately I cannot request a reception to the professor and therefore I address myself to you experts.

My doubts are:

• interpretation of the operation and use of the object. in particular I think I have been able to guess that somehow it is used as a carrier or support (which flows on a guide thanks to the 19 blocks) for some milling operation and, in particular, it blocks the rotation of the pin 6 through the scrolling of the pin 14, however I do not yet have a clear vision of how it is used specifically
• longitudinal position of the subgroup formed by the components 11, 16, 14, etc... I would have imagined it placed in correspondence of the dotted lines circled in the second photo, however I do not return then the position of the section plan b-b. or perhaps it is some regulatory compromise to reduce the necessary views and at the same time fully represent the object?
• I do not understand the absence of bronzine and/or lubrication between pin 6 and body 4. I agree that the spin of the pin is slow and salty, but I am not entirely convinced of the goodness of the design choice.
• the presence of the staircase circled in the third image. I guess she doesn't have a functional role. I can assume that it has only been realized to make the geometry of the subject a little more complicated.
• size and function of pin 5

Thank you in advance of time and answers

Christian

 

[Mario SJPD]

ok

 

[Mattymecc]

- interpretation of the operation and use of the object. in particular I think I have been able to guess that somehow it is used as a carrier or support (which flows on a guide thanks to the 19 blocks) for some milling operation and, in particular, it blocks the rotation of the pin 6 through the scrolling of the pin 14, however I do not yet have a clear vision of how it is used specifically

When you turn the pin 14, this screws on the screwdriver of the pin 13 (prevented in the rotation from the plug 18) thus freeing the rotation of the carrier.

- longitudinal position of the subgroup formed by the components 11, 16, 14, etc... I would have imagined it placed in correspondence of the lines dotted circled in the second photo, however I do not return then the position of the section plan b-b. or perhaps it is some regulatory compromise to reduce the necessary views and at the same time fully represent the object?

In my opinion, in the a-a section you do not see why they remain left of the section plan.

- I don't understand the absence of bronzine and/or lubrication between pin 6 and body 4. I agree that the spin of the pin is slow and salty, but I am not entirely convinced of the goodness of the design choice.

because you must not turn. is a screw that is screwed to hold the disk and the piece in place.

- the sizing and function of pin 5

to avoid the rotation of the locking disc when the knob is screwed on the fixing pin 6 or due to the forces that are transmitted by the tools that perform the processing.

to dimension it I would find a tangential force and the bending dimension.

I hope that my considerations (maybe not all correct) will be useful to you.

 

[ValveFloyd]

- interpretation of the operation and use of the object. in particular I think I have been able to guess that somehow it is used as a carrier or support (which flows on a guide thanks to the 19 blocks) for some milling operation and, in particular, it blocks the rotation of the pin 6 through the scrolling of the pin 14, however I do not yet have a clear vision of how it is used specifically

When you turn the pin 14, this screws on the screwdriver of the pin 13 (prevented in the rotation from the plug 18) thus freeing the rotation of the carrier.

- longitudinal position of the subgroup formed by the components 11, 16, 14, etc... I would have imagined it placed in correspondence of the lines dotted circled in the second photo, however I do not return then the position of the section plan b-b. or perhaps it is some regulatory compromise to reduce the necessary views and at the same time fully represent the object?

In my opinion, in the a-a section you do not see why they remain left of the section plan.

- I don't understand the absence of bronzine and/or lubrication between pin 6 and body 4. I agree that the spin of the pin is slow and salty, but I am not entirely convinced of the goodness of the design choice.

because you must not turn. is a screw that is screwed to hold the disk and the piece in place.

- the sizing and function of pin 5

to avoid the rotation of the locking disc when the knob is screwed on the fixing pin 6 or due to the forces that are transmitted by the tools that perform the processing.

to dimension it I would find a tangential force and the bending dimension.

I hope that my considerations (maybe not all correct) will be useful to you.

Thank you very much, certainly very useful!

I still have a few doubts though:

In my opinion, in the a-a section you do not see why they remain left of the section plan.

this is clear, however being the b-b section performed (as read by section a-a) more left than the dotted lines I mentioned, and assuming, as it seems more logical, that those lines represent subgroup 14, 15, etc... then that subgroup in section b-b should not be seen.
at that point I think two cases open:

1. that subgroup is located in the area between disk 7 and section plan b-b, but at this point what I was talking about (according to image)
2. has been represented, despite theoretically not seeing, to save views and sections, thanks to some "poetic license?", although I have no idea whether it is possible

When you turn the pin 14, this screws on the screwdriver of the pin 13 (prevented in the rotation from the plug 18) thus freeing the rotation of the carrier.

but the pin 18 does not also serve as a race end for the translation of the pin 13?

 

[Mattymecc]

- but the pin 18 doesn't also serve as a race end for the translation of the pin 13?

Yes, even for that. on the pin 13 is obtained a quarry like those per key within which the plug 18 flows.

- this is clear, however being the b-b section performed (as read by section a-a) more left than the dotted lines I mentioned, and assuming, as it seems more logical, that those lines represent subgroup 14, 15, etc... then that subgroup in section b-b should not be seen.

I think they did not take a "poetic license" from the norms of the design. the traces of the section plans seem to me congruent with the views reported. It doesn't matter if they're placed on an already dissected view. . .

 

[MassiVonWeizen]

dotted lines cannot represent components 14, 15, 11, etc. because these are in correspondence of the axis of the section. the dotted lines are used to give a reference to another overall. .
the components mentioned, which will be symmetrical and axial, are then placed in the intersection between the axis of section f and section b

 

[PIETRO2002]

I try to say mine:
is a milling tool, in the a-a section, the one you looked for in red, you can see the clamped piece (in the hold) and the disc milling above (in the hold).
the piece is clamped by flange 9 which is held in phase by plug 5. the clamping is done by turning the flyer 10.
the milling on the piece should be performed in two positions at 180°, the indexing system is clearly visible in the b-b section.
the details 19 (there are two ) serve for the placement of the tool on the milling machine's pallet.
with regard to the lubrication, since the rotation is carried out manually, it does not serve, calculating that in my opinion, all the pieces involved are tempered.
the clamping of the indexing plug is carried out via leaflet 15.
if you have any other doubts ask!

 

[PIETRO2002]

I forgot... the step you looked for and you see in the b-b section, I think it is created as a reference for the centering of the cutter compared to the tool.

 

[meccanicamg]

the best propedeutic and functional thing for a student is to redesign in 3d the equipment. you learn to read the drawing, shape, put on the table, interpret. then make views and sections and comparisons. If it's different, you're wrong. In my day, there weren't all these fools.

 

[PIETRO2002]

For those who did this job, understanding the total is a boy's game! for a student who probably has never seen a milling tool mounted on a milling machine, the thing is not very simple, the forum also serves to travasate what you know, logically it is different from doing the job instead of the student!

 

[ValveFloyd]

Thank you very much to all, I have received very enlightening answers. I think that the interpretation of pietro2002 is the most correct is plausible. I usually try to perform sketches in assonometry to try to understand geometry and operation, but not having followed courses of tm and not having practically never entered a workshop, as it always points out pietro2002, I had very serious difficulties in trying to view the way of working the tool.
the only doubts I have left now are:

• mounting of pin 14 and disk 16. it seems to me that the pin has a shoulder to allow the support on the compass but I can not understand how to allow the assembly/disassembly
• the geometry of the pieces to be blocked, because from the dashed lines I just can not see them. The only thing I think I understand is that disk 9 has two quarries in which it then goes to the mill, which then works by moving parallel to the pedestal.
• the meaning of the two details circled in the annex.

 

[asblo]

mounting of pin 14 and disk 16. it seems to me that the pin has a shoulder to allow the support on the compass but I can not understand how to allow the assembly/disassembly

Bye. disk 16 is full in the upper part where you see it is dissected and I think it is sunny below to be able to parade the pin 14

 

[PIETRO2002]

Thank you very much to all, I have received very enlightening answers. I think that the interpretation of pietro2002 is the most correct is plausible. I usually try to perform sketches in assonometry to try to understand geometry and operation, but not having followed courses of tm and not having practically never entered a workshop, as it always points out pietro2002, I had very serious difficulties in trying to view the way of working the tool.
the only doubts I have left now are:

• mounting of pin 14 and disk 16. it seems to me that the pin has a shoulder to allow the support on the compass but I can not understand how to allow the assembly/disassembly
• the geometry of the pieces to be blocked, because from the dashed lines I just can not see them. The only thing I think I understand is that disk 9 has two quarries in which it then goes to the mill, which then works by moving parallel to the pedestal.
• the meaning of the two details circled in the annex.

the particular 14 is turned in one piece, so in order to perform the assembly, the disk 16 will have a socket so that it can be threaded into the pin, then the screws that lock the disk 16 on block 11 are closed.
for the other two questions, at the moment I cannot answer you, I can imagine the shape of the piece to tighten, but in the absence of a design of the same, you can not give exact information!
Surely the clamping flange 9 will have the two quarries at 180° for the passage of the mill, it will have a socket to allow the fasatura compared to the piece centering on the plug 5.

 

[ValveFloyd]

Thank you so much, I really don't know how to thank you. now however for exercise as suggested model and I put in the table everything and, if it can please, as soon as possible load the results.

 

[ValveFloyd]

these are the models and the table of the first two details. Premetto that lack geometric tolerances and that dimensional tolerances and roughness have been chosen quite arbitrarily. I also had some difficulties in setting up the table because of the software, but I'm slowly setting myself up.

 

[MassiVonWeizen]

If you go to read some of the many drawings commented on in the forum you get an idea of what's wrong with the drawings.
learning critical design analysis is essential to correct and improve; When you're in a production office, they're gonna check your designs, maybe, the first months, but then you have to take it yourself.
then read a little discussion, correct and if you want to comment on your mistakes. hidden lines are not used on very complex designs and only where they make reading complicated!

 

[wert]

these are the models and the table of the first two details. Premetto that lack geometric tolerances and that dimensional tolerances and roughness have been chosen quite arbitrarily. I also had some difficulties in setting up the table because of the software, but I'm slowly setting myself up.

As a general advice, I think it's better not to tie up with the views... trying to stay in the smallest sheet format possible is a legacy of the past, when drawing to the tecnigraph. now with the cad the views come out in a second, so try to provide all the possible geometric information, to avoid misunderstandings. rather reduce the scale. in the base for example, I would add a view projected to the left, to show well the shape of the exhaust milling that is below and a view projected above to show that the milling 51.5 is completely passing (or not). In support I find both a forcing the view from b... there for there I thought of an American overturn. . only after I saw the arrow b. use a larger sheet and make normal projection if you can. the holes at 120° better if you put the coordinate quotas. Finally missing the general ruogosita, which usually puts on the cartilage.

 

[MassiVonWeizen]

always remember to make the reading of the drawing more immediate possible because those who will have to produce it do not always have the tranquility of the office; therefore, as an example, why put the 40th share of the fresata of the support in the view in the plant when you have a section with the clear and unmistakable silhouette? this then leads to a second observation that is not to spread over several seen the quotas of a single processing (and on this design there are at least two: holes m6, hole 30h10).
quotas must always be perfectly legible.

 

[ValveFloyd]

always remember to make the reading of the drawing more immediate possible because those who will have to produce it do not always have the tranquility of the office; therefore, as an example, why put the 40th share of the fresata of the support in the view in the plant when you have a section with the clear and unmistakable silhouette? this then leads to a second observation that is not to spread over several seen the quotas of a single processing (and on this design there are at least two: holes m6, hole 30h10).
quotas must always be perfectly legible.

thank you I will try to keep it in mind. I think it's one of the worst I've ever done. I initially had put most of the quotas on the a-a section, which is also the most representative view; I then scattered them to make the drawing more "ordered and readable", failing miserably.

hidden lines are not used on very complex designs and only where they make reading complicated!

I don't think I understand what lines you're referring to.

 

[MassiVonWeizen]

I don't think I understand what lines you're referring to.

Strange, it's one of the basics of technical design.
take pdf and redesign them in autocad and should be immediately clear to you the concept of hidden lines. Moreover you will serve as an analysis exercise I had already mentioned before.