NS Dev
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| posted on 8/11/06 at 04:24 PM |
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Drawing of Ford diff (lobro type) splines wanted
as the title, does anybody have a CAD drawing they can email to me in DXF form of the end profile of the ford sierra diff stub shaft splines.
I need to create a toolpath for a CNC spark eroder.....I have a cunning plan for my driveshaft dilemmas!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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NS Dev
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| posted on 9/11/06 at 10:51 AM |
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anybody?
Or anybody know a potential source? I can think of several but I doubt they would part with them as they make transmissions!!!
[Edited on 9/11/06 by NS Dev]
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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cossey
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| posted on 9/11/06 at 11:15 AM |
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the profile is standard so if youve got the major/minor diameters and the spline count it shouldnt be too hard to draw it up
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NS Dev
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| posted on 9/11/06 at 11:16 AM |
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Can get the dia's and count, but not sure what you mean by standard profile?
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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liam.mccaffrey
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| posted on 9/11/06 at 11:39 AM |
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shouldn't be had to cad up, considered cobbling somthing up in the lathe to cut them before but wasn't sure about the heat treatment.
all you need is no. splines, major diam and the included angle of the spline peak, 2 min job to draw up
EDIT
you dont need the spline angle
[Edited on 9/11/06 by liam.mccaffrey]
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NS Dev
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| posted on 9/11/06 at 11:58 AM |
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I know its easy to draw up, but on such a small spline how do you measure the included angle?
Best I can think of is 10:1 shadowgraph and a protractor and hope Ford chose a round number!
[Edited on 9/11/06 by NS Dev]
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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cossey
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| posted on 9/11/06 at 12:13 PM |
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quote:
Originally posted by NS Dev
Can get the dia's and count, but not sure what you mean by standard profile?
the spline profile is an involute curve so all you need to draw it is the major/minors dias and the spline count.
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NS Dev
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| posted on 9/11/06 at 12:47 PM |
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ahhhh!!!
wasn't aware of that, the splines look straight sided to my eye, but maybe not then!
will get it drawn like that and shadowgraph the drawing against the diff side-gear and see if they match!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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NS Dev
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| posted on 10/11/06 at 10:31 AM |
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Right, had a good look at the splines last night and I am sure they are straight sided!
if I get the major and minor diameters and spline count, can someone on here draw it for me and email me the DXF?
I can check it then on the shadowgraph cos I am not convinced!! I'm also less than sure of how to draw it, there seems to be a lot of discussion
on eng-tips.com about this subject!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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Peteff
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| posted on 10/11/06 at 10:40 AM |
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Didn't the man who used to do MK's one off bits use a milling machine to make them? I think Jon said he did them some for the GT1 but that
may have been different. Are they heat treated or just made from high grade material?
[Edited on 10/11/06 by Peteff]
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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NS Dev
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| posted on 10/11/06 at 10:49 AM |
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material wise, depends on what you want to do with them.
I can sort that anyway.
For this sort of thing a lump of EN16T, the engineers best friend, normally does the trick, although I "should" have a fairly abundant
supply of EN24 (817M40) in the near future so a lot of tough bits may be made from that! Its over 800N/sqmm tensile as ssupplied, and a LOT more if
heat treated.
I can also access heat treatment facilities for free too, but I am struggling on the drawing!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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liam.mccaffrey
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| posted on 10/11/06 at 10:57 AM |
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I am alomst sure that the splines are not involute there is no need to be, gear teeth however almost always are involute profile.
there is no need for the splines to be involute, involute teeth are to smooth and decrease parasitic loss of rolling meshed gears
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NS Dev
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| posted on 10/11/06 at 10:59 AM |
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But how do I draw the splines? They don't come to a point at top or bottom, so i need the included angle to be able to draw them, unless
somebody has a clever idea!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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omega 24 v6
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| posted on 10/11/06 at 12:39 PM |
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I've been watching this one with much interest and now I'like to contribute this-
If you know the external dia and the base dia and IF you can/could also measure the top/and bottom width of a peak and a trough then in theory there
would be a mathematical (or autocad process ) of creating the included angles.
I'm thinking about a polar array that is rotated as it's generated.
Also toying with the idea of placing bluetack or similar a pressing into the shaft to give a profile. Grease the shaft and press the blue tack on to
it. Place the whole lot in the freezer and when done slide the blue tack off. Then shine a light through it to create ashadow on a bit of white paper
(move to magnify perhaps) and measure the angle from this.
Now these are only wild thoughts but it maybe just the answer to what you need.
What do you think of my ideas.
If it looks wrong it probably is wrong.
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NS Dev
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| posted on 10/11/06 at 01:06 PM |
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I will be taking a sliver of a shaft using an abrasive cutoff, then putting it on a shadowgraph machine at work (which backlights it and magnifies it
10:1 at the same time.
This is fine but still hard to be really accurate, and splines need to be just that!
Yes, dead easy to rotate an array in autoCad, just tell it the pcd and how many and it does it for you, but it is drawing what to rotate really
accurately that I am stuck on.
When I get the spare diff it will come apart and be dissected!!!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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NS Dev
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| posted on 10/11/06 at 01:07 PM |
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PS what I really need is what GB Eng use, a really accurate 5 axis CMM, great for reverse engineering!!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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