Table Of Content

3.1 Mass and weight ‘The concept of mass and weight has abvendy Ween ialzudueed! in sections 17 and 1.8 of Bosie Snainearing ‘MASS is the quantity of matter of material in @ comps iba constant quanlily. ‘The Sf Unit for mass isthe kilogeara 1000 gramme — =1 kllogramme 1 000 kilogramme = 1 conae [NEIGH is the oume given to the effeet af the foxce af srasity scting an the mass of the component. A mass of 1 ke cquals e weight of 981 N approximately at sa level ‘Table 3.1 shows some calelations of massand weight, Fer most ‘workshop caiculetions it is normal tn work on the conversion of 1 eg mass 10 weight ‘This not only mks the problem easier to work out, iL also gies snare of safety" Table 3.1 Mass/nsight eamversion 1 Aste cain hae ana of 810. Cae wi ‘ewtons Chgmas = AON gts (861N ot anor: pry Bso¥emss - 3610x10 = a8 100N esi 28:1 10 Oalogenton) 2A bes sya har amis of 27. Colette te weg in Sean ‘Mi pamme = = 2751000 = DRT Ke OORT igmee = OUR x10 = DET weight ‘ote bat the wes ingrumtes hd tbe cond ls Klas ele the eit ion pul proceed SeACT TO MAGS 8. anatunisium casting wighs 250%. Coles er ssf anime eg EIN woighe = DT Remany ASO R weigh = 2850! 10 = 286 ee mae A Aree noone seeds 30.837 Cokeaat te mae (blonesion > 1 000newtany 20 = soo00n som S = S000 10 = somes 10odky = ttome Sooke = Stonne 1s useful Lo be able Lo ealeulate che mast and weight of cone ponentsin the Workshop, For example: 1. To chuck if lifting talde is adequate co lfc che component safety Uo ealeulate the material east, as mort row materia ‘weight 3, To ealeulate the charge of # furnace to see if these is sufficient metal ta make the easting, te sold by 32 Density Density is defined as mass par unit uotum, ‘Thal is, density SU volume For example, the density of copper i 0-008 9 gitum? o, erch cubic milliactte of eoppor his mass of 0-008 9 gramme. W488 = VOLUME x DENSITY EXAMPLE: Calrutate the mas nf a enmponent of volume (hi metee! "The donsicy af copper is 0008 9 g!mm* Mass ~ olume x density = 0 10" « 0-008 9 feuasert volume Lo mm?» = 2670 gamme = 261 tilogramme “The sowresponding weight of the component wuld be: weigh nats acceleration dup tm gravity = 267 « 981 tmass must bein ke} = 26-2 neweon (Ni For workshop purposes it would be aecurale enough to ealeulace che weight a: weight - 287» 10 = 267 ‘he ‘err’ af O-5 W ison the right side Lo give a margin of sate. ‘Tablo 8.2 ivos the densities for some cypical engineering materials Figure 8.1 shows hos che mass ard weighe of the solids given in Basie Engineering, table 3.23, cam be calculate. Table 3.2. Densities of common engineering materiats MATERIAL a “omni ono si 2560 ‘am opr e210 po a2 9500 an 3080 pone 11.499 veut 10 To oan 7200 ine uw to | 700 —a— T | Youn: ‘Mom = tuna x dorany wrng = OTT Site | EET ata ~ aoe E Grande (ores 4 ig 8.1 Calcul Most engineering components can be broken oso inte the basic shapes shown in-Pig 1. Figures 3.2 and 3.4 inrhusive give some examples of calewlations of the mass and weight of simple ‘enginecring coxrponemts, 3.3. Sheet metal components Shoot metal is often gold by mast per unit arc for a given chickness, rather than by Using volume and density examples for sheets of typical engineering materials Figure 3.5 shows how blank weights can he ealeulutod using the data in table 3.3 Table 3.4 Massfuni¢ area for shoot metal [oe alee gente foe nd son, Por her neta ae notes) Table 3.3 gives some THICKNESS (ml | ~ 7 cass assure anna NOTES on Aigioie | Bad ehotee | yiein® yim? ASE OF TABLE an tauss Tpiee |. Reema ans Gone | BR | RSS ons cova | ore | fenbecuteee oo | Sand | oHb | tebe tact sve cunt | pan | Bergen, vom | O8at | she | fies oan | caus | gaieg | ogog | now eon ma | oS | oso BOs | O38 | eins 0881 L one | Sais | Ea sree ows gaz | caer ann | 883 | oe a 102 eo cose | oa ooo | 888 | S88 ave 100 corre | om wats ous | S308 | Sue 1s ons 8B 0766 * cae | 85 | TSE | cic oe oreo guar | tar ene | SST | EBT | 2, vocmnate ne 000 oases | sag | mesial or os | St? | tne | amd 60 awaa | 19 : ea | SHEE | EI | suas ama or Us 4283 5 Baas | J mm thie} steel i oass | Geek | BR | Uebel i wo come | jong | Raper ows | S83 | MRE | ppeerets 500 2945. gase_ | amratorcoppe! im oso | SHS ESS | ABATE ov caro a0 | prea arto B48 8 Aas Fre oan | cess eam | -ss5 isnt 1 om | S88f Gah | SSE ro | orga i ta vio | SEG | RSS Vs osa62 | guise wo | TREE | 6a wo vesse | 12908 soo | TRE | 13589 200 wsis0 | sae | ve | EES | HER 250 19295 | woa2s ao | BS | NEE mei gay | eee n BAY BE em + gosto 3920 3.4 Bar components Bar fs often sold hy mass per unit length for a given exosesection, rather Clan by using volume and density ‘Table 34 gives some examples for bars of typieal engineering materials, Figure 3.6 shows hhow blank weights ean be caleulated using the data in fable 2.4 ‘Table .aMass/matre run for mild steel hors CIRCULAR APOTION —_AQUAABEBTION WixAGONAL SECEION Dana [ee Sen] Mex T sts ri me |e ie 1 bose] oame [ oor : cin oc | oa |g D168 é om | om | 8 240 : ois. 7 | oso 7 0320 § oso: 3 | ows Daa 4 oss; 9 | cco 9 2545 1a sso} i | om | den 2 | cms) om | ns B 2865 un vaso) as | tz la 13s 1% ws] a6 | 390 je 10 8 rr | i |e i 200 m i aa] 2 | ao | a 208 B wae | zz} at 2 324 aa eer foe | ar rr at s mas | 25 | 525, » 453 40 sas | 2s | sae 2 33 3 wa | oo | oor » 605 P ia | oe | orm 2 eas a zo | 3% | os H 73 0 ze | a | ws % 570 a so | a | ua 2B 370 *0 gor | ao | aaa © ws to =o | a2 | pes a 18 us aso | at | 300 “ 1300 ws vorseo | as | dee tej se rs, we50 | ak | te a | es moj mo | so | 93 sl | lea zs | soso | 5s | ase) os 29 so | ano | oo | ase 0 ae wo | asso | as | ae 3 233 3.5 Mass of the contents of a container tthe volume of s containor is known and the density af the fluid ne powder stored is know chen ha mass of the lid ar powder ean be ‘aleulaled as shown in Fig. 27. Mert 09 1 00058 ia Fig.3.7 Maas of contents of container