Question

BASED ON REAL DATA TAKEN BY AN OPTICAL 3D SURFACE PROFILOMETER The surface of a part has a profile given by the y-values (distance to the surface from a reference centerline) vs. x-values (distance along the surface from a reference starting location) shown in the enclosed "txf file. Before fikering to remove the surface waviness, the yvalues are as shown under the column labeled "nfilered yvalues". After propar filtering to remove the surface waviness, the yalues are re-caleulasted, and shown under the column labeled "filtered yvalues" The roughness width cutoff for fihering was 800 pm Be careful with units. Note that ""is given to you in "mm", but "y" is in "em" Plot both the unfiltered yovalues and the filtered yvalues vs. distance x. You can plot by hand, or using any software of your prefarence. Ploting by hand may be time consuming Isuggest you use software such as Google Sheets or Microsoft Excel. b. a Is the wavincss a low frequency or a high frequency component of the surface profile? Identify the waviness on your plots Approximately, what is the distance between roughness peaks (waviness excluded)? Use your plot to approximate this parameter by eye d. c. What is the value of Ra AA? What is the value of Ra RMS? f. . What peocess may have produced such surface? Use the chart of roughness vs. manufacturing process from the lecture Power Point, or elsewhere, to support your answer What is the lay in the following surface symbols? Sketch the surfaces. Investigate what machining operations may produce such surface pattems Med Med Chome d 125 Excapts fro this wak may be spodacod by indracton for dieribuon ce a n ot his for toting a inactional parposes only to yScons 107or 10rof he 1976 Ud Sases Copre Act wiho the pemiof hecopighe orle 1-1 IME 258 Manufacturing Methods and Materials I Homework From Fundametals of Modern Manufactaring, Se (published by Wiley) MPGroover 2012, with selected additional exerciss 3. Convert 1 m into thousandths of an inch Convert cne ten thousandth of an inch into um. 4. For cach of the following process pains, circle the one that produces a smaller surface roughness. If the processes re about equal, circle both. a) Sand Casting vs. Polishing b) EDM vs. Turning Rolling vs. Grinding e) 6 The surface roughness is generally smallear a) Across the lay b) Along the lay c) None of the above d) Doe't know, will take the panalty

Answer 1

hich in di iali,. plane of projeehon of th.'view in Lag in the stymbol ndi ular Auface paHensto the which the used Sanfoare reof ay ue es Sesend raboli Afare paterns f the nfae hich indicalos that the are approsimalely eroular aolahve tothe center tocohiah thoymbel is applie Safone End milling 6 inches 2. 53

Inehs 2.53 ieneh 0.03962thocusan dth an

10 thousand anin de lind 3.53 em lo x 0 X /1000 x 2.53 ID IDOO x 2.53 x /D ix 2.53x 10 X 253 Lm CAn 2.5 3 xloo :

Aofae reghren Aunfaxe Poaghns rfo ngheon Polishing froducas Turning rodoces Rall roes maller Kmalle n a a gmallen the lay aller es is not