Go to duckduckgo, look up "cutting wheel" and "disk cutter". What do you see? Serious question ... do they adjust the results according to the local vernacular of the user? Would make some sense, but might get a trifle confusing sometimes ... first of all, define "local" :-)
I normally use DDG but normally with JS turned off. I did the previous searches with google for some odd reason. Hopefully that'll mean my search is a bit more "pure" in this case as I didn't pollute it.
Here are the first 4 results for "cutting wheel" via DDG with JS On. Please excuse my not linkifying the links :)
https://www.amazon.com/Cutting-Wheel/s?ie=UTF8&page=1&rh=i%3Aaps%2Ck%3ACutting%20Wheel (various cutting disks mostly 4.5", about half-way down the page is something closer to what you're referring to I think)
http://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_ff3=9&pub=5574933636&toolid=10001&campid=5336728181&customid=&icep_uq=cutting+wheel&icep_sellerId=&icep_ex_kw=&icep_sortBy=12&icep_catId=&icep_minPrice=&icep_maxPrice=&ipn=psmain&icep_vectorid=229466&kwid=902099&mtid=824&kw=lg (first few are for much smaller wheels, larger tools start later in the page)
https://www.alibaba.com/showroom/cutting-wheel.html (mainly 4.5 -7" on the first few lines, some not identified by size)
http://www.cutting-wheels.com/ (their graphics show lots of large cutting tools)
I'll change browser (from Pale Moon to Waterfox) for the next search - DDG with JS for "disk cutter" (with quotes, both searches, btw). First 4 results :
https://duckduckgo.com/y.js?u3=https%3A%2F%2Fr.search.yahoo.com%2Fcbclk%2FdWU9RjRCRjkwMzQ4RUMyNENBQyZ1dD0xNTEyOTA1Mjk1NDc4JnVvPTc5MDk2MTM4MjExNjA5Jmx0PTImZXM9dXZUYmN0NEdQUzhXQ2ZxcQ%2D%2D%2FRV%3D2%2FRE%3D1512934095%2FRO%3D10%2FRU%3Dhttps%253a%252f%252fwww.bing.com%252faclick%253fld%253dd39aVSue6nqMeI_pZjsYHnijVUCUyDHUntYx9DJJcKKzEM394al%2D794ONJx_ms7v7BHDPl4o1EaKdEWe9NVa91XVQPS2%2DAuWbKiz%2Ddq7B2tI5RxRFjmkH87R4Q138XfTGLJVd6hZCU5MDQG2Q60aHrKEECZ3lxyRmCcTpHDEFQ22bUaE0V%2526u%253dhttp%25253a%25252f%25252f19.xg4ken.com%25252ftrk%25252fv1%25253fprof%25253d571%252526camp%25253d157594%252526affcode%25253dcr5364187%252526kct%25253dmsn%252526kchid%25253d160000636%252526cid%25253d79096138211609%252526queryStr%25253d%25252520%25252522disk%25252520cutter%25252522%252526kdv%25253dc%252526criteriaid%25253dkwd%2D79096146864946%25253aloc%2D134%252526adgroupid%25253d1265537954570837%252526campaignid%25253d291320625%252526locphy%25253d2510%252526url%25253dhttp%25253a%25252f%25252fwww.cooksongold.com%25252fJewellery%2DTools%25252f%2DRange%25253dDisc_Cutters%25252f%2DSize%25253d0%25252f%2DType%25253d0%25252f%2DBrand%25253d0%25252f%2DFont%25253d0%25252f%252526prdsearch%25253dy%25253f%2FRK%3D2%2FRS%3Dmx3m0pTGk9R0YCTLjS.u.C98YOw%2D (advert for jewellery tools)
http://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_ff3=9&pub=5574933636&toolid=10001&campid=5336728181&customid=&icep_uq=disc+cutter&icep_sellerId=&icep_ex_kw=&icep_sortBy=12&icep_catId=&icep_minPrice=&icep_maxPrice=&ipn=psmain&icep_vectorid=229466&kwid=902099&mtid=824&kw=lg (seems to be all small stuff like you mention)
https://www.etsy.com/market/disc_cutter (as above)
https://www.amazon.com/disk-cutter/s?ie=UTF8&page=1&rh=i%3Aaps%2Ck%3Adisk%20cutter
Most of the first lot of DDG results agree with you on this, only about 3/4 of the way down did I start to see stuff referring to the larger power tools.
Slight difference with turning JS off but that may be altered due to my previous search. I see an Alibaba link come into the #6 spot for larger blades, then about 15 or so a reference to farm machinery.
Interesting results - different search engines give very diiferent results. DDG is my main engine of choice but I use google if I am not seeing what I wish (DDG struggles with limiting searches to NZ sites, which may also be impacting on the results in this case).
Depends on where you live and who you ask. A few years back "scientists" published results of a study where they claimed they'd recently discovered NZ had 4 english dialects. I could name several more than that just from growing up - with differences based on race, church affiliation/religion, what sort of town you were in (smaller rural, dormitory, larger city etc), age group, type of school (public etc, poor/rich and so on), type of work (farming vs office vs mechanic vs....) and a whole lot of other factors. Some NZ accents are actually quite different to others, eg anyone in the North Island can pick someone from Gore (vs Invercargil) based on how they pronounce certain words or sounds.
So not too surprising even in supposedly standardised industries you can find significant differences in definitions. Especially when we have most of the Pacific between us!
(Made the mistake of leaving a couple of the wrong bits of JS on, 4th time through that captcha bullshit (at least 4th time, so far) - about time a tech site got that shit fixed isn't it El Reg? It also does stupid stuff like wiping out the text of the message and often breaking the reply link, such as in this case!))