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Re: Cabin Fever
« Reply #20 on: January 25, 2007, 09:45:49 PM »
There are now several pages of photos of this years show on the New England Model Engineering Society web site at http://neme-s.org/Cabin_Fever_2007/cabin_fever_expo_2007.htm
Re: Cabin Fever
« Reply #21 on: January 28, 2007, 05:01:46 PM »
Brian

    It was a pleasure to meet you at the Cabin Fever Expo in PA the other week. I am in the process of getting togeather all the parts and components to do the modifications to my Shopbot. I had looked up the encoder part number from the encoders on the steppers that you are using and I believe they are 300 Count per rev. A friend of mine may be able to supply me with some steppers with encoders already mounted. The encoders are either 1000 or 1250 count per rev. Would these be usable? If so what if any difference will it make? The last question is who did you say was going to sell the interface board for the encoders?

Thanks
Sam Harbold
Re: Cabin Fever
« Reply #22 on: January 28, 2007, 10:53:22 PM »
Hello Sam,
This is the board that was in the Router that I was running http://www.rogersmachine.net/

Also you are going to want to use about 300 count per rev encoders... any more then that and you may not be able to read them at top speed

Thanks
Brian


Fixing problems one post at a time ;)

www.newfangledsolutions.com
www.machsupport.com
Re: Cabin Fever
« Reply #23 on: January 31, 2007, 08:41:02 AM »
Hello Brian,

Unfortunately I was unable to attend and meet you at the Cabin Fever Expo, but I am very interested in the system that you were demoing there.

I would like to incorporate the feedback system you are using into m y current cnc setup.
Would you be willing to share your stepper motor and encoder information ( model, size, supplier, etc:)?

I have already contacted Ron at Rogers Machine and his boards are compatible with my existing system.
I just need to get new double shaft steppers and the proper encoders to make it work.

Thank you,
Tom
Re: Cabin Fever
« Reply #24 on: February 01, 2007, 08:51:17 PM »
Tom

   Here is the information I received from Brian at the show regarding the steppers and encoders.

For the steppers Brian recommended the Keling model KL23H286-20-8B  http://www.kelinginc.net/SMotorstock.html

The encoders he had on his machine were US Digital  E4P-300-250-T   http://www.usdigital.com/products/e4p/

I have been doing some checking and have also found this stepper with a little more torque   24Y504D-LW8   
http://www.anaheimautomation.com/manuals/L010280%20-%2024Y%20Series%20Spec%20Sheet.pdf

One other item is on the encoders I spoke with a tech at US digital the other day.  The gentleman was telling me that the basic E4P encoder has a single ended output which is good for about 6-10 foot of cable run. When I explained to him my application on a 96" x 48" CNC router he recommended going to a differential output. By doing so you can increase the cable run to well over 100' with a much more reliable signal. You can add a driver to the E4P which will output a differential signal or you can go to a E5 encoder which has a differential output. This also complicates the control box end.  I downloaded the manual for Rogers Machine board and it is setup for a singled ended input so you would need to add a receiver at the control box for each encoder to convert it back to single ended.  I am planning on contacting Rogers Machine to see if they may have a board available that will except a differential signal which would make things much easier. I will let you know what I find out. 

Sam

Re: Cabin Fever
« Reply #25 on: February 02, 2007, 08:35:03 AM »
Sam,

Thank you very much for this information, I will also do some research into this upgrade path and post if I come up with anything that will help.

How is your conversion coming, if I remember you are converting an older Shopbot Pr correct?

The only thing left from the my original machine after my upgrade is some of the uni-struts, the only regret I have is that I didn't go with a geared motor.

My machine is much faster and more powerful now, and much more dependable due to using Mach3 but but my resolution is poor due to the direct drive( 20 tooth pinion 20 degree Racks).

So depending on what you want to produce on your machine keep this in mind.

If I do the encoder upgrade I will need new double shaft motors so I will go with a geared one at that time.

Tom
Re: Cabin Fever
« Reply #26 on: February 02, 2007, 08:59:35 AM »
Tom

   Yes I am converting an older PR Shopbot.  I am still getting the parts and pieces together so that I can do the upgrade at one time.  We have been using the machine everyday so it is important to have as little downtime as possible.  I am planning on using the original 3.6:1 belt reductions units that came with the machine.  For this reason I have been trying to stay with the size 23 steppers. The Anaheim Automation stepper is a 24 size unit but has the same mounting dimensions as a 23 with 475 oz-in or torque.

    Do you have any photos of your machine? I would be interested in seeing what you have done with yours.  My upgrades are not written in stone so I am open for suggestions.

Thanks
Sam
Re: Cabin Fever
« Reply #27 on: February 02, 2007, 10:46:14 AM »
Hi Brian,

Glad I found this thread and especially the post about the encoders. I'm curious, and not knowing.....I have to ask. My current machine is an old Digital Tool machine using rack and pinion. Single ended steppers driving a transmission that sits on the rack. For this encoder system to work, would I need the encoders on the motors or on the pinion shaft that cogs in the rack?

Mike

ps would this same encoder setup work for a rotary 4th axis?
Re: Cabin Fever
« Reply #28 on: February 03, 2007, 10:17:06 AM »
Sam,

Follow this link for the latest pictures of my cnc upgrade    http://www.accurate-inspections.com/pr cnc upgrade/


I would love to see some pictures of your original 3.6:1 belt reductions units.

I have only heard of these as mine was cable driven.

Fell free to ask for more pictures or info if needed and I will post them to my site.

I am currently working on a blog site with my component info and pricing, but I am having problems posting pictures.

I will post the link when it is working.
Tom
Re: Cabin Fever
« Reply #29 on: February 03, 2007, 10:02:40 PM »
Tom

   Thanks for the link to the photos.  By adding the angle iron how much did it stiffen the carriage?

   How do you like your Z axis? I had started to redesign my Z and it is almost identical to yours.

   Here is a link to some photos of the belt reduction units?

   http://wa3umc.com  on the menu click on photography and then on photos when the photo page opens the photos will be under shop. If you have any problems let me know.

Thanks
Sam