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C l in m t ic e f f e c t s o n m a c h i n e t o o l sMach ine too l designs fo r use in atempera te a rea such as the Un i tedK i n g d o m m a y r e q u ir e m o d i f i c a t i o n f o ro p e ra t io n in t r o p ic a l o r a r c t i c c o n d i -t io n s . A n M T I R A w o r k i n g g r o u p ha sp ro d u c e d a re fe re n c e d o c u m e n t wh ic hp ro v id e s a d v ic e o n e q u ip p in g a m a c h in eto o l t o f u n c t io n u n d e r v a r io u s ' n o n -s ta n d a rd' c o n d i t i o n s a n d wh ic h , i t i shoped , " w i l l assis t in es tab l ish ing abasis fo r agreement b etwe en su ppl i erand purchaser" .

S t a n d a r d s I n f o r m a t i o n S h e et N o2 2 - En v i ro n m e n ta l p ro te c t i o n o fmach ine too ls - covers env i ro nm enta ls i t u a t io n s ra n g in g f r o m te m p e ra tu re i ns to rage to e lec t r ica l in te r fe rence ,ind ic a t ing the measures needed . To he lpm a c h in e to o l m a n u fa c tu re rs o b ta ind e ta il s o f t h e e n v i ro n m e n ta l c o n d i t i o n sin wh ic h th e i r p ro d u c ts a re l i k e l y t o b eused , an exam ple is g iven o f a ques t ion -n a i re f o r c u s tom e rs w h ic h c o v e rsc l i m a t i c c o n d i t i o n s , e l e c t r i c i ty s u p p l y ,a l t i tude , t ranspor ta t ion , s to rage con-d i t i o n s o n s i t e a n d o th e r c r i t e r i a . S ISNo 22 is ava ilab le a t 5 .00 per copy .Th e M a c h in e To o l T ra d e sAs s o c ia t i o n , 6 2 Ba y s wa te r Ro a d ,L o n d o n W 2 3 P H , U K o r Th e M a c h in eTo o l I n d u s t r y Re se arch As s o c ia t i o n ,Hu l ley Road , Macc tes f ie ld , Chesh i reS K 1 0 2 N E , U K

The mo de18 716 Teledyne Gurteyis su i tab le for ap pl i cat ions th at requi ret he i nc rement a l measurement o f l i nea rpos i t ion or speed to a prec is /on in therange 0.5 to 5 pmR o t a r y a n d l in e a r e n c n d e r sTwo e n c o d e rs - o n e ro ta r y , o n e l i n e a rhave been launched by Te ledyneGu r l e y . ' Re d ', ' wh i te ' a n d ' b lu e ' l i n e so f ro ta ry encoder each fea tu re f ives izes , f rom 1 .1 in (27 .9 mm } to 3 .5 in(8 8 .9 m m ) d ia m e te r . Th e ' r e d ' l in efea tu re AB EC c lass 5 bear ings , anunbreaka b le p las t ic d isc and reso lu t ionsu p to f o u r t im e s th e d i sc l i n e c o u n t .Th e ' wh i te ' m o d e ls a ls o o f fe r ABE C 7bearings and c hro me on g lass d iscs butreso lu t ions up to 8 t imes the d isc l inec o u n t . Th e ' b lu e ' l i n e fe a tu re s ABE C 7bearings, c hrom e o n g lass d iscs, dualread ing heads fo r h igher accuracy anda re s o lu t i o n u p to 4 0 t im e s th e d i sc l i n ec o u n t - a f e a tu r e c o u n t o f 3 6 0 0 0 0 /r e v o l u t i o n .

L a r g e o p t ic s g i m b a l m o u n t sStab le and p rec ise o r ien ta t ion o f 4 and6 inch (10 and 15 mm ) op t ic s is,c la imed poss ib le wi th the 620 ser ies o fg i m ba t m o u n t s f r o m N e w p o r t C o r p o ra -t ion . Shake- free g im ba l l ing is sa id tobe assured by pre loaded bal l bearingp ivo t assembl ies . Op t ica l e lements a ref ro n t - l o a d e d o n to th re e c o m p re s s iv e

620 se ri es g i mba i m oun t s o f f e r p rec iseo r i en t a t i on o f 4 and 6 i n (100 and150 mm ) op t i cs

po in ts and a re he ld secure ly in p laceb y th re e lo c k in g s to p s p o s i t i o n e dd i re c t l y o p p o s i te t h e m to m in im iz esur face d is to r t ion . Once in p lace , thef ro n t s u r fa c e o f t h e o p t i c b e co m esa l ig n e d w i th t h e ro ta t i o n a l a xe s fo rt r a n s la t io n - f r e e g im b a l l i n g .Bo th ro ta t i o n a l d r i ve s a rea n c h o re d to a s in g le f r a m e to m in im iz ecross ta lk and a re edge-mounted ou t o ft h e o p t i c a l p a th fo r s a fe ty a n d c o n -ven ience . The mic rom ete rs a re gradua-ted in 3 0 a rc -sec d iv is ions and eachm a y b e a d ju ste d th ro u g h 1 0 , w i t h s u ba rc-sec reso lu t ion . In ad d i t io n to tappedm o u n t in g h o le s a lo n g th e e dg e s, t h u m b -s c rew a n c h ors a l l o w th e m o u n t t o b er ig id ly a t tached to a tab le o r base .T h e s e new mounts have a s lenderp ro f i le , a la rge c lea r aper tu re , and a rec o m p a t i b le w i t h N e w p o r t ' s m o t o r i ze ddr ives .N e w p o r t C o r p o r a t i on , P O B o x8 0 2 0 , F o u n t a i n V a l l e y , C A 9 2 7 2 8 -8 0 2 0 , U S A

Some o f the fea tu res o f them o d e l 8716 l inear encoder a re a reso-lu t i o n o f 0 .6 # m , s ca le l e n g th s u p to2 m , o u tp u t d a ta ra te s u p to 5 0 0 k H za n d an o p t io n a l z e ro i n d e x . Th e o p t i c a lread ing head takes up less than tw ocub ic inches .T e l e d y n e G u r l e y , 5 1 4 F u l t o nS t r ee t , T r o y , N Y 1 2 1 81 , U S A o rNo rc ro f t Dy n a m ic s L td , Fe l l o wsHouse, H igh St ree t , Pewsey , Wi l tsh i reS N 9 5 A F , U K

C o urs e s on op t ic a l e ng ine e r ingTh is summer, two courses on app l iedop t ics /op t ica l eng ineer ing a re be ingru n in t h e UK. Th e S i ra Fo u n d a t io ncourse 'Op t ica l Eng ineer ing I ' is be ingpresen ted aga in on 1 3- 14 June 1984 .The p rogramm e is des igned to g ive ab a sic i n t r o d u c t io n to o p t i c a l e n g in e e r-ing , w i th spec ial re fe rence to qua l i tyassurance, and comprises lectures andprac t ica l dem ons t r a t ion sess ions . Thecourse is in tended fo r eng ineers andte c h n o lo g is t s wh o w is h to a c q u i re anunders tand ing o f bas ic op t ics and thetes t ing o f components and sys tems.In s t ru c t i o n w i l l p r i n c ip a l l y b e g i ve n b yle c tu re rs f r o m th e Po ly te c h n ic o f t h eSo u th Ba n k , L o n d o n , a n d b y S i ra s ~a ff .Th e Co n fe re n c e Un i t , S i r a L td ,So u th H i l l , Ch is le h u rs t , Ke n t BR75 E H , U KAn ' Ap p l i e d o p t ic s s u m m e r c o u rs e ' w i l lb e h e ld a t Im p e r ia l Co l le g e , L o n d o n ,f r o m 2 - 1 3 J u l y 1 9 8 4 . T h i s t w o w e e kcourse is in tende d fo r sc ien t is ts ,eng ineers and managers who se t ra in ingis i n f i e ld s o th e r t h a n o p t i c s b u t i t i sappa ren t ly a lso su i tab le as a re f reshercourse fo r op t ica l spec ia l is ts . I t w i l lc o n s is t o f a p p ro x im a te l y 4 0 le c tu resemph as iz ing bas ic concep ts in app l iedop t ics and laser phys ics and w i l l inc luded e m o n s t ra t i o n e x p e r im e n ts a n d v is i tsto re levan t labora to r ies in the Opt icsSec t ion a t Im per ia l Co l lege . Thelec tu res wi l l a l l be g iven by the s ta f f o ft h e Op t i c s Se c t io n a n d p r in te d le c tu ren o te s w i l t b e p ro v id e dThe fee fo r the course is 450(a p p ro x im a te l y $ 7 0 0 ) e x c lu s iv e o fa c c o m m o d a t io n . Fo r f u r th e r i n fo rm a -t ion and reg is t ra t ion fo rms, p leasec o n ta c t :Pro fessor J . C. Da in ty , Op t icsSe c t io n , B la c k e t t L a b o ra to ry , Im p e r ia lCo l l e g e , L o n d o n SW 7 2 BZ, UK

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