Use glass scales with 7i96S for closed loop feedback
- MachNegativeOne
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21 Oct 2023 16:50 - 21 Oct 2023 18:57 #283448
by MachNegativeOne
On my RF45 Mill I have a DRO with glass scales. I would like to know if I can use them with the 7i96S and my stepper motors for a closed loop system. I understand that I can interface the scales to the 7i69S with a 7I85 or 7I85S and a DB25 cable.
My scales are Ditron DC10 with .005mm resolution. My calculations are as follows: The scales are 60m/min max working speed, which is 1m/sec@ 5um, that is 200,000 counts/sec .As it is a quadrature count of A/B, each channel is max 50Khz
So would this be fast enough for a closed loop system? Or should I just use them for some other form of position verification.
thanks for the help
My scales are Ditron DC10 with .005mm resolution. My calculations are as follows: The scales are 60m/min max working speed, which is 1m/sec@ 5um, that is 200,000 counts/sec .As it is a quadrature count of A/B, each channel is max 50Khz
So would this be fast enough for a closed loop system? Or should I just use them for some other form of position verification.
thanks for the help
Last edit: 21 Oct 2023 18:57 by MachNegativeOne.
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- tommylight
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21 Oct 2023 21:33 #283459
by tommylight
Replied by tommylight on topic Use glass scales with 7i96S for closed loop feedback
Short answer,
Yes easily.
Long answer will have to wait for someone else to chime in, or i will later, sorry.
Yes easily.
Long answer will have to wait for someone else to chime in, or i will later, sorry.
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22 Oct 2023 00:47 #283471
by tommylight
Replied by tommylight on topic Use glass scales with 7i96S for closed loop feedback
OK, Mesa can count much more than 50KHz, so for normal quadrature TTL level 5V encoders or glass scales you would need a Mesa 7i85 or 7i85S, one has Smart serials and encoders, the other has stepgens and encoders, i would go for smart serial as you already have 5 stepgens on Mesa 7i96S, both can probably do differential and single ended wiring.
I think there is already firmware made for such a combo, flashing it takes a single line and a minute of time.
I think there is already firmware made for such a combo, flashing it takes a single line and a minute of time.
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- MachNegativeOne
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22 Oct 2023 00:49 #283472
by MachNegativeOne
Replied by MachNegativeOne on topic Use glass scales with 7i96S for closed loop feedback
Thanks very much for the help.
p.s. love the avatar image - the pup looks like a fun one!
p.s. love the avatar image - the pup looks like a fun one!
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22 Oct 2023 01:28 #283474
by tommylight
Replied by tommylight on topic Use glass scales with 7i96S for closed loop feedback
You are welcomed, always.
Yes, the pup was fun, chewing on my foot every day, and strangely, never ever bit hard to scratch the shoes.
Yes, the pup was fun, chewing on my foot every day, and strangely, never ever bit hard to scratch the shoes.
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