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No Problemo, fly cutter in hob spindle, tangental feed, takes a while, but then you don't have to wait for a worm hob, Was 13 weeks, what do they run these days? Also How much? Internal gears ground with wheel dressed with Garner Template dresser.Ī surface grinder modified for Gear grinding.ĬHEEMA (CIMA) P5's, damn fine machine, (You want a 43 tooth Worm gear to fit a 1920's Ice Machine?)
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The magnitude of error on the "S" a tenth or less. The bottom of the upper “S” being the same point as top of the lower “S”. So for two arcs you would get a chart of
#Solidworks 2005 cad input plus#
On Lower numbers of teeth, today I would use two or three arcs as opposed to a spline, which are I believe come out as a series of flats the involute is an ever increasing radial arc, and so a series of arcs gives a better approximation.Īs each point is calculated to be on the involute, when charted the portion in between each point will appear as an elongated “S”, plus at the top, minus below. By late 80’s gave drawing and detail dimensions & sent out to wire EDM, following the purchase of GARNER Universal wheel dresser, they supplied the first template to my dimensions. Initially CNC Mill, plotting points into Generic Cadd. (How did you make your templates for the profile dresser?). Tooth thining or thickening a backlash value is put in, to thicken enlarged pinnions a negative value is put in. Spread sheets, I do Quatro Pro, early days, less keystrokes, also it would read any format, The old Supercalc, lotus 123, excell, and I did not have to put my discs in everytime I wanted to run, treated me as a customer not a criminal, Lotus 123 cost me a bunch, and demanded i put in my disc each time, Quatro $79.00 first time out, ate lotus and excell for lunch. 30/diametral pitch radius, or a straight line tan to last point on base dia to 0,0 center of gear, trim with fillet rad as above. On Low numbers of teeth, the root dia will be below the Base dia, extend the arc to the root dia & fillet with a. So I use one three point arc for 35 and up, less teeth additional arcs it comes out more accurate than a series of flats, you are useing the Radius, Vector approach, I use x,y points, 3 point arc thru them, low number of teeth two sets does most gears.
#Solidworks 2005 cad input Pc#
With the advent of caculators and PC computers, n/c machining, mills and wire edm with five points, a three point arc thru 1,2,&3 then a second arc thru 3, 4, & 5, the error on say 35 teeth and up is hard to chart within a tenth, on lower numbers the error increases, so more points, 123, 345, 567, 789, a template style dresser on a $20,000 surface grinder, beats out the BIG BOYS with their $330,000 CNC gear grinder. So, if points at the base dia or root dia, pitch dia, and outside dia are calculated and a three point arc is swung through them, involute is zero at those points, between the base or root dia and the pitch dia, the radius is too large, flattening it out or minus on the curve, between the pitch dia and the Outside dia the radius is too small, plus stock on, this gives an elongated "S" shape to the involute chart when inspected, if its within tolerance of the class of gear run, Your home free. Undercut teeth all explained!ĭuring my Geargrinding years in the job shop environment, inexpensive short cuts, lead to a radius dresser that approximated the involute within say 60% of the involute tolerance band of the gear to be ground. If You come across one recomend you get it, no Idea why it's not republished. The book that turned on the lights of the Involute was:Īll functions of Involutometry & Trigonometry are displayed accross two pages and are listed for every one hundreth of a degree.This is in fact a co-ordinate chart for an involute of unit one! I have a lot of gear books,was at it from feb 1958 thru sept 1993. Heck, calculating the points in the spreadsheet isn't immediately obvious, simply because I have an equation that willt ell me what they are.
#Solidworks 2005 cad input how to#
I did end up with a good approximation of an involute tooth profile, but setting tooth thickness, addendum, and dedendum was rather arbitrary.ĭo you think you could explain how you figured out the tooth point layout? I'm decent at working inside the solidworks program, but I still don't know how to do things like import spreadsheets or even lay out a series of points calculated on a spreadsheet. Then I used the spline tool to interpolate a curve between the ends of the second set of lines. Then I used my calculator to calculate how long each line coming off of these had to be (pretty simple, if a bit repetitive). These lines were laid out every two degrees. The way I laid out the curve way by first sketching a bunch of radial "for construction" lines that stopped at the base circle. Les, that is helpful, but the way I'm laying out points is completely different (and far inferior) to yours.