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+--- Thread: Homemade Power Drawbar (/thread-2720.html)
RE: Homemade Power Drawbar - EdK - 06-30-2015
Hi Mike,
I think you have an error on the drawing for the base plate. The horizontal dimension for the 3/4" drill rod guide posts is shown as 2.920" from the center-line. According to my CAD program, that would put part of the rod off of the base. Going by your grid paper, I think the correct dimension should be 2.375" from the center-line. See sketch below (click on it to enlarge it). The one on the left is with the dimension from your drawing and the one on the right is with the 2.375" dimension. Let me know if I'm missing something, which is usually the case.
Ed
[attachment=11184]
RE: Homemade Power Drawbar - EdK - 06-30-2015
Mike,
Looking at your drawing again, it's not drawn to scale on the graph paper so my guess at the 2.375" dimension in my previous post is probably off a little. But clearly the 2.920" dimension won't work. My current thought is that maybe you transposed two digits and the dimension should be 2.290".
Ed
RE: Homemade Power Drawbar - zmotorsports - 06-30-2015
(06-30-2015, 02:28 PM)EdK Wrote: Mike,
Looking at your drawing again, it's not drawn to scale on the graph paper so my guess at the 2.375" dimension in my previous post is probably off a little. But clearly the 2.920" dimension won't work. My current thought is that maybe you transposed two digits and the dimension should be 2.290".
Ed
That is possible Ed. It is not exactly to scale I do know that.
I will have to check my drawings and get back with you. I may have transposed a number because I know it fits the machine.
But my CAD program is a little less precise than yours. 
Mike.
RE: Homemade Power Drawbar - EdK - 06-30-2015
Thanks Mike. No rush since my mill arrival date is still seven weeks away. I'm just getting prepared as much as I can prior to its arrival. I've got the pneumatic parts coming from McMaster tomorrow, other than the 'T' fittings which I forgot about.
Ed
RE: Homemade Power Drawbar - EdK - 06-30-2015
Mike,
I took a look at your videos again and I was able to get a pretty good view of your drawing shown on the video. There are two dimensions on that drawing that are different than the drawing you posted in this thread. See sketch below. That looks better.
Ed
[attachment=11185]
RE: Homemade Power Drawbar - EdK - 07-01-2015
Mike,
When you get a chance, would you please measure the length of the guide bars on yours?
Thanks,
Ed
RE: Homemade Power Drawbar - zmotorsports - 07-02-2015
Will do Ed. Been a busy past couple of days at work and my home shop. I will try to measure those bars tonight.
As far as the dimensions on the video/thread I will double check them but I do remember changing one or two on the fly as I was machining as they didn't add up. Remember my earlier statement about my CAD being in my head not on a PC.
I will double check them for ya.
Mike.
RE: Homemade Power Drawbar - EdK - 07-02-2015
(07-02-2015, 08:46 AM)zmotorsports Wrote: Will do Ed. Been a busy past couple of days at work and my home shop. I will try to measure those bars tonight.
As far as the dimensions on the video/thread I will double check them but I do remember changing one or two on the fly as I was machining as they didn't add up. Remember my earlier statement about my CAD being in my head not on a PC.
I will double check them for ya.
Mike.
That would be great Mike. I appreciate all of your help with this.
By the way, my comments about the drawing dimensions where not meant as a criticism so I hope you don't take them as such. With your help I can get some CAD drawings done that you can give to people that would like to copy your design. It's a really clean design. I'll build mine from the resulting CAD drawings to prove out the dimensions.
Ed
RE: Homemade Power Drawbar - zmotorsports - 07-02-2015
(07-02-2015, 08:59 AM)EdK Wrote:(07-02-2015, 08:46 AM)zmotorsports Wrote: Will do Ed. Been a busy past couple of days at work and my home shop. I will try to measure those bars tonight.
As far as the dimensions on the video/thread I will double check them but I do remember changing one or two on the fly as I was machining as they didn't add up. Remember my earlier statement about my CAD being in my head not on a PC.
I will double check them for ya.
Mike.
That would be great Mike. I appreciate all of your help with this.
By the way, my comments about the drawing dimensions where not meant as a criticism so I hope you don't take them as such. With your help I can get some CAD drawings done that you can give to people that would like to copy your design. It's a really clean design. I'll build mine from the resulting CAD drawings to prove out the dimensions.
Ed
No problem. I am only human and have a tendency to make mistakes on occassion. But let's just keep that between us, huh.
Mike.
RE: Homemade Power Drawbar - EdK - 07-02-2015
(07-02-2015, 12:02 PM)zmotorsports Wrote: ....
.... I am only human and have a tendency to make mistakes on occassion. But let's just keep that between us, huh.
Mike.
No problem, your secret is safe with me.
Ed