Someone check my math please.... Arduino Shaper Ram FPM Sensor
- Thread starter YYCHM
- Start date
I came up with that value the first time to, but that sounds way too low to me. My minute includes the return strokes.
I derived the forward strokes by counting the number of times the head bumped my hand over the course of a minute.
Not sure now.... this is why I posed the question...
Safarir
(Charles)
To get the proper answer, we are missing the ratio of time the shaper is doing forward vs backward stroke. Assuming 50%, the average speed is:
1 minutes x 50% = 0.5minutes
6.25inch = 0.52083333333 feet
0.52083333333 feet x 52 = 27.0833333333 feet
27.08333333 feet / 0.5 minutes = ~54 feet / minutes
1 minutes x 50% = 0.5minutes
6.25inch = 0.52083333333 feet
0.52083333333 feet x 52 = 27.0833333333 feet
27.08333333 feet / 0.5 minutes = ~54 feet / minutes
trlvn
Ultra Member
@YYCHM I was checking the Vintage Machinery site and it appears that they don't have any information on your shaper. AIUI, your machines was made by The Peerless Machine & Tool Company in Guelph, ON:
Do you have a couple of 'glamour' shots of your shaper that could be contributed to their site? I'm happy to do the upload if you don't have/want an account there.
Craig
Do you have a couple of 'glamour' shots of your shaper that could be contributed to their site? I'm happy to do the upload if you don't have/want an account there.
Craig
It has a “Scotch Yoke“ which is driven by the bull gear. Yes, the reverse stroke is faster than the fwd, power, stroke. You can see it by looking at the geometry.
When I first got the shaper, the motor was not wired correctly, it ran “backwards”. That resulted in the fwd stroke to be fast and the return to be slow - backwards for any shaper. I changed the motor direction to fix that.
Go ahead with the upload if you like.
Peerless Shaper Basement Install
Well.... the Gingery shaper just wet my appetite for something a little better so... Monday, I acquired this 8" Peerless shaper from @RobinHood (Thanks Rudy). Looks innocent enough doesn't it. It's NOT, it's heavier than all get out. This is the conclusion after offloading it from the...
@francist has one as well.
If there is something specific you need let me know. There is essentially nothing about these machines available online.
Last edited:
I love math, and doing research. If you want to do a f@#$ton (metric f@#$tonne / 1.1), of calculations, here’s the math for another brand of shaper.
He’s getting roughly 2:1 extend/retract ratio at the broadest setting, so you’re probably safe using about 80 fpm as the top cutting speed
Metal Shaper Column 04
Kay Fisher's Metal Shaper columns as published in the NEMES Gazette.
www.neme-s.org
He’s getting roughly 2:1 extend/retract ratio at the broadest setting, so you’re probably safe using about 80 fpm as the top cutting speed
LOL..... I have a paper copy of all the articles http://www.neme-s.org/shapers/shaper_columns.html
Just trying to get a rough feel for what's it's currently doing in order to compare with what my Arduino FPM meter produces when I have all the bits a pieces on hand. I have the sw coded just need the shield and sensor in order to complete that project. I think I will change my code to display forward FPM and reverse FPM just for interests sake now.
Last edited:
Just found this video…
I think I used oversimplified math... I like the 2:1 ratio (2/3 to 1/3) of time it takes for the FWD stroke to REV stroke ratio.
Using this analogy, the cutting speed in your case would be:
for one stroke, you would get 6.25in / 40sec = 0.15625 in/sec
or, for one min (6.25 x 60) / 40 = 9.375 in/min
but the shaper was doing 52 strokes / min, thus (52 x 6.25 x 60) / 40 = 487.5 in/min or 40.625 ft/min
I think I used oversimplified math... I like the 2:1 ratio (2/3 to 1/3) of time it takes for the FWD stroke to REV stroke ratio.
Using this analogy, the cutting speed in your case would be:
for one stroke, you would get 6.25in / 40sec = 0.15625 in/sec
or, for one min (6.25 x 60) / 40 = 9.375 in/min
but the shaper was doing 52 strokes / min, thus (52 x 6.25 x 60) / 40 = 487.5 in/min or 40.625 ft/min
I hate to suggest… Two IR sensors, spaced a known distance apart, a piece of reflective tape, a shroud to cover the IR sensors, save clock time at first IR trigger, read clock time at second IR trigger, a bit of math. I have a few spare IR triggers I could send you.
The shaper stroke is adjustable from 0 to 8", two fixed points is not a practical approach in this case.
I have an analog IR distance sensor and a sonic distance sensor inbound by snail mail thanks...... Should be here next week with luck. My wire has cleared customs in Calgary so Amazon should deliver that anytime now.
Last edited:
That sounds better to me thanks!
