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Topics - telfish

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DIY AstroEQ / Using TMC2130 with Astro EQ
« on: July 27, 2019, 18:59:40 »
I asked a question on this a while ago. And now I can answer my own question.

Reason is I wanted to use 2130 drivers is because they microstep at 200 micro steps per main step. This produces almost servo like performance. The way I got them working was as follows.

On the under side of the board is a bridge that needs to be soldered. This puts the driver in stand alone mode and it behaves like a 2100 but with the microsteps. I use 16 steps in the utility and the MKS L runs flawlessly with that setting with decent slew rates and superb tracking. I am using it on a CGE conversion with 0.9 degree steppers.   

DIY AstroEQ / TMC2130 support.
« on: May 30, 2019, 14:31:20 »
Decided with my low geared setup on the CGE that unless I want to fit expensive geared motors I need to get the microsteps up for tracking.  I want to use the TMC 2130 which has mode changes via software on the spi pins. Microstepping up  to 256 is supported.

Is there any plan to support that driver in Astroeq?

DIY AstroEQ / Gear settings
« on: May 20, 2019, 19:33:01 »
I have finished a conversion and need confirmation of my settings.

My mounts RA and DEC worm wheels have 180 teeth.
I have a driven pulley with 16 teeth and also a 16 teeth pulley on the worm gear.

My settings motor step angle 1.8
Motor gear ratio 1
Worm gear ratio 180

I am running a MKS gen L and amusing the Ramps 1.4 as the board as I can't find a firmware for the MKS. I am using TMC2100 drivers with all links closed, uStep gear change is disabled and Motor microstep level is set to 16..

Can anyone confirm these are the right settings, everything seems to be working fine though the mount does not seem to slew quite to the target. Am checking this the next clear night.

Running firmware v8.14

Thanks   Terry

DIY AstroEQ / CGE need confirmation of settings.
« on: November 15, 2018, 19:48:52 »
Have just finished a Belt drive CGE conversion which is working but I believe missing the target when slewing, not by much but enough. Here are my numbers from the config utility.

I am using Ramps with a TMC 2208 with all links in which should give 16 usteps interpolated to 256.

The Worm has 180 teeth
The stepper cog has 17 teeth
The Worm cog has 16 teeth.

The Stepper has 1.8 deg steps

My settings in the utility are

Motor steps 1.8
Motor gear 1.0625
Worm 180

Usteps disabled
16 Usteps

 Axis steps per rev 612000
Worm steps/rev 3400
Sidereal IRQ 6364
Siderial speed 896
Resoloution 2.118

Can you take a look and see if I am messing up somewhere. The mount slews fine and will track, not sure how good that is yet, but comparing it with my Atlas when slewed to the same object it's out about the same in both axis.

DIY AstroEQ / Celstron CGE anyone done a stepper conversion?
« on: September 20, 2018, 04:09:11 »
I have successfully finished my Atlas non goto conversion and now want to do a conversion of an old CGE mount to stepper, anyone done this and can give me some tips on motors to use and whats needed bracket and belt wise to make it work.


DIY AstroEQ / 2208's are great ,but!
« on: February 08, 2018, 20:28:25 »
Fitted my long awaited 2208's to the Atlas ramps setup, This has been performing perfectly on the 8825's if somewhat noisy.

The 2208's cured all that and the mount is now pretty much silent in slew and track. But and there is always one. Is that slews and probably tracking is now running 100% more distance than before. So if I am pointed at the home position and ask it to go due East I end up with both axes doubling the distance exactly and the scope points down to the ground.

I removed all the bridging clips on the ramps board and am running it in default mode.

Any ideas on this one?


Mount Support / Gears,gears,gears
« on: January 14, 2018, 22:56:03 »
Now I am on to the mechanical part of my EQ6 Mod. I have a couple of drive mounting plates but need to source the gears.

I took a look at the ones in my goto Atlas and they are a 12 tooth gear on the stepper shaft and a 32 tooth transfer gear that meshes with the gear in the mount attached to the Worm gear.

Anyone know what these two gears are pitch wise and where I can find them.



DIY AstroEQ / Getting there, two issues need solving
« on: January 13, 2018, 18:43:18 »
OK, so I got my non goto Atlas/EQ6 stripped out the board and motors, put in a set of motors and gears from my other Atlas so I could test the EQ 2560 setup.

It works pretty well it slews, it tracks. However I have two issues probably setup settings.

If I set the slew to Max in eqmod the scope slews and stalls. If I set it to 400 it slews fine though obviously slower than I would like. I am guessing there is a setting in one of the files to set the maximum slew speed, a pointer would be good.

The other thing which is a bit weird is that although I have set the home position correctly and it returns to home properly. When I slew to the zenith it points due east and when I points east it points to the zenith!

So it's 90 degrees out. If I set the scope horizontal at home position it is fine. I will check the position of the saddle in case the last owner turned it for some reason.

Oh and the last thing. I am using the 8255 drivers on a 2560, the motors are still energized when the mount is parked. Is there any way to change this in the config file?

DIY AstroEQ / Tb6600 setup
« on: January 09, 2018, 19:16:09 »
Having got the software working fine with the Mega I used a couple of TB6600 drivers to test. The steppers move fine as long as I have the enable- disconnected, this means the steppers are permanently energized even when the scope is parked. Also as I change microstepping from the dip switches the slew and track rate changes proportionately. This does not seem right. At high speed the motors stall after a couple of revolutions and make a high pitched sound until the slew is over.

I have tried all ways to wire the enable line if it is as normal with ena+ to 5v and ena- to the enable pin I get no movement, if reversed the same.

Am I supposed to wire the MS1 to 3 outputs low or high, right now they are just floating.

This is the unit I am using.



DIY AstroEQ / Mega 2560 build can connect but not slew or track.
« on: January 07, 2018, 14:17:56 »
I am bench testing a new build with a Mega2560 and two 8255 drivers. I have go to the stage where I can connect to Eqascom and get an RA and DEC returned. When first connecting I get a pulse from the steppers ad the "mount" is in the unparked position.

So far so good.

I can't however get it to park, slew, or track, no motion from the steppers which are not energized. I am using the Atlas/Eq6 config file.

The Board and drivers are known to be good, I believe my wiring from the schematic is OK.

Any ideas?

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