Gallery, Projects and General > How to's
Making a Sub Spindle
sbwhart:
Made the end caps, but not without some difficulty. Up to now I had done very little thread cutting on my machine, so I was going through a bit of a learning curve how to deal with the back lash etc, so I struggled a bit with the first one, but the second was more straight forward.
This is the set up:- what I had to do was take the saddle past the start point, then wind it back by hand to the start point, to help getting the start point I marked the chuck and set the dial bezel on zero. I had to remember to set the correct motor direction before switching on the power, it all seemed to work ok. :thumbup:
Finished end caps
Cheers
:beer:
Stew
sbwhart:
Forgot to explain about the threads. :doh:
Because the size of the threads are dictated by the size of the bearings what you end up with is an illegitimate thread (bastard thread to use the correct technical term). As the internal thread is made first to get to the OD of the male thread for a 60 deg metric thread form you add 2 * 0.036 " to the ID of the internal thread. 0.036 = 1/24TPI * Cos(30)
Cheers
:beer:
Stew
dsquire:
--- Quote from: sbwhart on September 19, 2009, 11:43:22 AM ---Forgot to explain about the threads. :doh:
Because the size of the threads are dictated by the size of the bearings what you end up with is an illegitimate thread (bastard thread to use the correct technical term). As the internal thread is made first to get to the OD of the male thread for a 60 deg metric thread form you add 2 * 0.036 " to the ID of the internal thread. 0.036 = 1/24TPI * Cos(30)
Cheers
:beer:
Stew
--- End quote ---
Stew
Do you realize that in maybe 100 years when some future member or MadModder or other forum member comes across this piece of equipment and has to make a new part what this will do to him? :lol: :lol: :lol:
He will say to himself, I'll just go to my scrap bin and get a piece of metal and turn up a new piece and single point a thread and it will be just like when that great machinest made it a 100 years ago. :doh: :doh:
Now as he sits down with his calipers and other measuring tools to make a crap-o-cad drawing everything proceeds fine, until he measures the thread. He looks it up in his metric thread charts and can't find it. Ok, I'll just look in this old Machinest hand book from my Great Great Grandfather, probably be something in there. Nope, lots of threads of all diferent kinds that come close but nothing the same. Ok, I'll post this on the New MadModder forum. Someone there will surley know something about it. :mmr:
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As the sun slowly sets in the west he can be seen sitting outside under a man made shade tree slowly pulling out the last of the grey hairs that he has left. :(
Cheers :beer:
Don
sbwhart:
Don
We could start a new thread standard we could call it Universal MadModder (UMM) with a 60 deg or 55 deg thread form any pitch you want and any Major Diameter you want and any fit you want
:mmr:
:lol: :lol: :lol: :lol: :lol: :lol:
Cheers
Stew
arnoldb:
Great going Stew :clap: :clap: :clap:
I like your idea of UMM :lol: :lol: - could make life interesting for copy-cats :lol: :lol: :lol:
:beer: Arnold
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