Cutting Splines
Cutting Splines
I have a lawn mower (peerless) transmission that I want to convert to use in an early non replica of a 1920's motorcycle with a low horsepower, low RPM engine. I need to extend the input shaft on one end to add a sprocket ( I'm doing away with the RA input shaft and bevel set up). There are 49 fine splines, I've counted three times and will do it a again before I program my CNC indexer for the cuts. I know nothing of cutting splines or how they are specified. The shaft is 7/8", turned down to exactly .7450 at the spline section. My question is how are splines and the cutters specified? Thanks.
Bruce
Bruce
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Re: Cutting Splines
Splines are not standardized so the fun begins there. Typical spines (but not all) have involute profiles which are the same as gear teeth. For a start, consider it as a gear with the same OD and 49 teeth. If you come up with a standard gear cutter - great. More likely it will be non standard and you will then need to grind a single tool bit for use in a fly cutter, the easiest? solution.
Re: Cutting Splines
If that is true then there is use for worn gearcutter of correct pitch. Worn ones have had their depth reduced and could be sharpened to where they still cut but not at the depth of a gear.
Re: Cutting Splines
Hello sprospro wrote:If that is true then there is use for worn gearcutter of correct pitch. Worn ones have had their depth reduced and could be sharpened to where they still cut but not at the depth of a gear.
That is a Very Cool Idea.
Ken.
One must remember.
The best learning experiences come
from working with the older Masters.
Ken.
The best learning experiences come
from working with the older Masters.
Ken.
Re: Cutting Splines
Thanks for the tips so far. Now that I've been looking around I have seen spline cutters in 45 and 90 degree angles so I guess I have to determine the angle of the spline. I gather that there are no spline gauges available. Thanks.
Bruce
Bruce
Re: Cutting Splines
If you don't have a good way to measure the splines on the existing shaft, and you're making the mating part anyway... you can recut the splines to something you *do* know the shape of, which would make it easier to do the mating part.
Could you just turn the shaft down and put a key in it?
Could you just turn the shaft down and put a key in it?
Re: Cutting Splines
It may be possible to use an existing spline shaft and splice it to your shaft.
Don Young
Re: Cutting Splines
The shaft splines will match the input shaft gear cluster's internal spline. I think that extending the shaft with splicing would be more work than cutting splines. I just thought that there would be some one out there who has extensive experience with this.
Thanks
Thanks
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Re: Cutting Splines
There are two types of splines
Automotive Standards covered under ASA-B5.15-1946
and
Aircraft Standards .....which I do not have info on.
They both usually are 30 PA Involute curved teeth, but the aircraft teeth are shorter
They are measured and specified under Van Keuren tables, using wires (like thread wires) for measurement
Standards go from 6 to 50 teeth
If they are 45 degree teeth or 90 degree straight sided, you may need either the 1946 S.A.E. Handbook
for specs, or the 1951 Edition .
Not sure of later issues
Standards go from 6 to 100 teeth
Rich
Automotive Standards covered under ASA-B5.15-1946
and
Aircraft Standards .....which I do not have info on.
They both usually are 30 PA Involute curved teeth, but the aircraft teeth are shorter
They are measured and specified under Van Keuren tables, using wires (like thread wires) for measurement
Standards go from 6 to 50 teeth
If they are 45 degree teeth or 90 degree straight sided, you may need either the 1946 S.A.E. Handbook
for specs, or the 1951 Edition .
Not sure of later issues
Standards go from 6 to 100 teeth
Rich
Re: Cutting Splines
Thanks Rich, just what I needed. Also I had earlier posted that the suggestion to extend the shaft would be difficult but have now figured out a way that would be easy but might not have explored the idea without the suggestion from Don Young so thank you Don.
Re: Cutting Splines
One must remember.
The best learning experiences come
from working with the older Masters.
Ken.
The best learning experiences come
from working with the older Masters.
Ken.
Re: Cutting Splines
Well for what its worth; I only spent some time grinding the correct HSS profile.