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  • Users: cervantes
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  1. cervantes

    calculations of flatness based on EN 485-3

    Hi I have some problems with understanding idea of calculating overall deviation - does anyone of you are familiar with this standard? a) "%" is not strictly clear for me, what are they reffering to when considering percentage values? b) why widthwise deviation is percentage larger than...
  2. cervantes

    ISO 1938 calculation example (plain limit gauges of linear size)

    hello Gentelmens, with regards to ISO 1938... I have it in front of my eyes and I am not sure if I am doing this correctly I have a slot (to be checked with bar gauge type F) with envelope requirement, let's say 20mm +/- 0.2 Cause the size tolerance is not given as an ISO code, I am using...
  3. cervantes

    thread durability

    hello, this seems to be a simple case however I have some doubts there's a statement that thread coils (not sure if I used correct word, eng is not my mother language) are not carrying a load (screw core is always taken under consideration during calculations) - but when the thread of...
  4. cervantes

    thread class of heli-coil screw lock

    Hi all, I was wondering - "standard" Heli-Coil insert thread class is defined at 6H tolerance when we are talking about screw "lock" insert version - GO gauge does not pass, which is rather normal situation because it's tighter I am wondering - how to verify if thread class in screw lock...
  5. cervantes

    axis datum - bearing

    Hi, just a simple question I think, fig 9.7 from ASME is more or less the only suitable example for this generally it was hard for me to find any examples for runout with more than one datum (except fi 9.7) so I just to ask if this is correctly described: I am measuring runout , but for...
  6. cervantes

    ISO14405-2 example interpretation

    Hi An extract from ISO14405-2 is attached. (Geometrical product specifications (GPS) -- Dimensional tolerancing -- Part 2: Dimensions other than linear sizes) // ISO 14405-2:2011 illustrates the use of geometrical tolerancing for dimensions that are not linear sizes to avoid the ambiguity that...
  7. cervantes

    simple question - datum reference frame

    hello all, During studying ASME standard one question came to me: please see attachment: there is a page from ASME and my drawing is there any chance to create exactly the same reference frame as given in ASME but without using second hole axis as a base C? (i moved it to right to make it...
  8. cervantes

    cutouts pattern

    Hi before I created this post I did a lot of research without any significant success, that's why it is time to ask for you help as you always provide good feedback for my further research I prepare a drawing, we are considering European ISO I think it is more about linear dimensioning and...
  9. cervantes

    max. tool measurement uncertainty vs gauge size

    Hi, When a manufacturer says in datasheet that measurement uncertainty of 150mm (resolution 0.01) caliper is +.- 0.03 mm - then is it applied to a maximum measured size or also to for e.g. 24 mm? I want to check myself measurement uncertainty of my 150mm caliper using standard deviation...
  10. cervantes

    precision shaft tolerances

    Hi i am a little bit confused about tolerances given for induction hardened and hard chrome plated linear shaft (see attachment) let's analyze diameter 4: for ISO h7 tolerance, default circularity at level 0.005 - ok for me cylindricity (parallelism) at level 0.01 - ok for me but straightness...
  11. cervantes

    roughness symbol for raw surface

    Hi I just got stucked cause I read an opinion of quite experienced engineer and I started to think that I am wrong whole my designing life :) See attachment. Imagine you are buying plate of aluminium, 25x10 and you cut it on saw machine to distance 50. You do not need to machine length later...
  12. cervantes

    free state

    Hi there is only one example in ASME standard and it is also hard to find anything else in the net. There is a small plate of aluminium 3x15 which bends under its own weight or it is just naturally bended due to material physics. It will be attached later to flat surface so it will be...
  13. cervantes

    standard for cleanliness / greasiness testing

    Hello, Someone told me that there is a way to test cleanliness / greasiness (e.g. after material washing) with stick tape. I mean there must be a dynamometer which evaluates a force required to remove a tape. I think it was not ISO 2409 (cross-cut test) as I didn't find anything about force...
  14. cervantes

    suspicious friction coefficient for anodized die extrusion profile

    Hello, strange situation - anyone can help me I have a profile, drawing stated as follows: material Aluminum 6063F22, Aging T6, natural anodizing 10my now, two different batches from the same supplier have difference in friction coefficient (against homogenous polyurethane material) around...
  15. cervantes

    "knurling" on stainless steel

    Hello, any tips on how this kind of "knurling" was made on this stainless steel pipe? 1) pipe was not deformed during this proces 2) it is not additionaly welded (however it looks like this) - this surface is "torned out" from pipe material 3) anyone knows machines which can do this type of...
  16. cervantes

    ISO10683 flake zinc family

    Hello all, I do not have access to this standard. But Zintec, Dacromet, Riwdac, Geomet, Delta-Tone 9000, Delta Protect etc. belongs to the "family" of flake zinc. Can anyone tell, that if I am ordering Geomet coated screw it has the same properties as screw which is described only as "flZn"...
  17. cervantes

    temperature of machining

    Hello, does any of you met drawing documentation which specifies temperature of workshop where machining proces is being realised? it is about details made from aluminium Thanks, M.
  18. cervantes

    circularity / diameter tolerance

    hello one more time, well, haven't found exact answer anywhere yet so I am asking: 1) if there is a hole, with diameter let's say 50 and tolerance M6 and no form and position tolerance (circularity) is given on the drawing (and default workshop circularity is let's say 0.1mm) so then I can not...
  19. cervantes

    Metrology fundamentals

    Hello, just to be sure: is a thesis that "measurement should be done with an instrument which resolution is 10x greater than measured eg. length" is a "golden rule" or is it described in any norm? example: to avoid measurement error analysis for length 23,5 I should use caliper with...
  20. cervantes

    compound gears formulae

    Hi all, I needed to go through essentials of gear calculations. I found nice tutorial here http://www.societyofrobots.com/mechanics_gears.shtml During my studies I found a possible mistake that it was so obvious that I start to feel that maybe I was thinking wrong? Please go to compound gear...

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