7/26/2023 0 Comments Bevel protractorWhen I am trying to replicate an angle on an existing part I will measure the X and Y with either the height gage or a pair of Mititoyo digital calipers(accurate to a 0.001), angles are then spot on to the original part. When I am laying out parts whether it be sheet metal or a machined part, I like to use X an Y heights to establish the angle. For parts you are grinding you obviously need a high degree of accuracy which only a sine bar and gage blocks can provide, same with the mill. Interesting designs, good for layout work on something that does not require a high degree of accuracy.I love trig so doing the math is just how I am comfortable setting up my angles. The instructions are essential, unlike the western standard whose operation can be figured out easily.īottom line is that a decent quality version of either will do what you need. Frankly I could never get my head round the really clever stuff and, in part at least because my import has lethally sharp edges to the scales and other parts, it didn't seem worthwhile to put the effort into becoming fluent. It is more versatile than the western standard with a wider range of set-ups. Not so good at larger, angle between, jobs as the big protractor can be just as obtrusive as the long rulers on the western standard and the relatively short straight edges make it harder to get a stable base. Hence its best at measuring angles on things, especially smaller stuff which sort of sit inside the protractor. The first style traces its ancestry back to a form of gun layers clinometer and was primarily developed as atoolmakers protractor. Not a showstopper just a fact of life you work round. Not so good at angle on things jobs as the long rulers now get in the way a bit. As such its best with larger items and gauging the angle of things in relation to each other where the relatively long rulers help give a stable measurment base. The second one is what might be called "western standard style" and might best be considered a more accurate version of the protractor head from the common combination square set. Unlike Harry I prefer the second style as I find it much easier to set-up and understand exactly what I'm measuring. All of these are cool, but personally I end up using the first two noted items a lot more. Plus optical transits (actually stated reading to. I've also owned a couple of fancy Hilger Watts "protractors" with precision levels, optical sights, etc. The import was sort of usable, but a buying a used better quality unit - new enough that the graduations are still readily visible - would be a better deal. I have owned a number of units like the other photo (including Starrett, B&S, and an import). Somewhere in here comes a protractor head for a quality combination square - good to a degree.Īs for vernier reading universal bevel protractors, I haven't used one of the Russian ones but some folks seem to like them. You can buy an import set of solid angle gages, good from 1 to 45 degrees or so (by one degree), quite affordably. These will be useful for both the mill and grinder. degrees) are the next useful thing, since they can be used to set work within a vise, to set supports to commonly used angles, even to check compounds at 30 degrees. and be happy to get within a degree.įor many, solid angle standards (30, 45 etc. You'll use it for sharpening tool angles, checking insert angles, etc. Most everyone needs a cheap protractor of the sort with a stainless head and a swivel arm.
0 Comments
Leave a Reply. |