Hello Guest it is March 29, 2024, 11:38:31 AM

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Messages - jab_814

Pages: 1 2 3 4 5 »
1
General Mach Discussion / Re: formula for slotted disc
« on: September 27, 2012, 02:02:33 PM »
I got it hood, It was the pmdx 106 speedcontrol . I had the anaolog voltage set at 5 volts . It needed to be 10 volts for the vfd. Works great now
Thanks Again guys

2
General Mach Discussion / Re: formula for slotted disc
« on: September 27, 2012, 10:54:04 AM »
I am pretty sure it has optos
i will check manual
I am using a pmdx 122 bob

3
General Mach Discussion / Re: formula for slotted disc
« on: September 27, 2012, 10:01:19 AM »
Hood,
My index debounce was at 5, I changed it to 0.
It did not have an effect on the rpm reading

4
General Mach Discussion / Re: formula for slotted disc
« on: September 27, 2012, 09:50:39 AM »
Rich,
I widened the slot about 50%, it still maxes out at 2340
Thanks though

5
General Mach Discussion / Re: formula for slotted disc
« on: September 27, 2012, 09:15:40 AM »
Hood,
4 In Disk
.375 width slot

Rich,
I though about using a cd (Great Idea).
I will try widening the slot

Thanks

6
General Mach Discussion / Re: formula for slotted disc
« on: September 27, 2012, 01:46:52 AM »
Hood,
Not Quite sure what your looking for .
But it is a Pmdx 170 optical sensor
•Response time of less than 10 uS
Max pulse rate 25 Khz

7
General Mach Discussion / Re: formula for slotted disc
« on: September 26, 2012, 08:12:57 PM »
Just curious,
what speed range is anybody else getting when it comes to measuring rpm?

8
General Mach Discussion / Re: formula for slotted disc
« on: September 26, 2012, 11:34:13 AM »
Thanks 762x51
I checked my math and it would call for a .316 wide slot assuming i make it 50 percent bigger . so I have the slot oversized by .059 . It seems like something else is limiting the sensor .

9
General Mach Discussion / Re: formula for slotted disc
« on: September 26, 2012, 10:37:17 AM »
Thanks Mike

Yes it was checked with a tachometer

10
General Mach Discussion / formula for slotted disc
« on: September 26, 2012, 09:32:42 AM »
Hi Guys,
I currently have a slotted disc with a opto sensor to measure the rpm of a spindle on a mill.
As of now the rpm is measureing correctly, however It reads rpm up to 2340 . How do i calculate what size disc and slot I would need to measure up to 5000 rpm. I currently am using a 4 inch disk with a .375 slot. What are the limiting factors, formula for calculating the range of the rpm being sensored with respect to disc diameter and slot width. Would I be giving up the low range to accomplish a higher sensored rpm.

Thanks Joe

Pages: 1 2 3 4 5 »