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23rd May 2020, 10:41 PM #1Golden Member
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Waldown Toolpost Grinder - Alternate uses
I recently purchased a C1 Waldown TPG, from a forum member, with the intention of using it uncoventionally on a Milling machine to true up a worn NT40 internal spindle taper, but I haven't got around to trying that yet. I also have some semi finished grinding wheel adaptors for my old surface grinder that just need the 1.250" locating diameter machined so I figured that the best way would be to grind then mounted on the actual machine spindle to ensure minimum run out on both the diameter and the face.
The results were much better than I expected.
TPG1 (2).JPG
TPG2 (2).JPG
TPG3 (2).JPG
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23rd May 2020, 11:07 PM #2Most Valued Member
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Sorry to tell you this, but your attachments come with the message "Invalid Attachment specified. If you followed a valid link, please notify the administrator"
Your other pic came out fine, they look really good, and as you say should have minimum runout.
KrynTo grow old is mandatory, growing up is optional.
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23rd May 2020, 11:26 PM #3
As Kryn said the first 2 pictu didn't come through, and we all love pictures.
Looks like they turned out greatUsing Tapatalk
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24th May 2020, 07:51 PM #4Golden Member
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I can see three pictures. Having just acquired a TPG myself (got to get a drive belt for it yet), I really like this application. How do you plan on working to the taper of the spindle on the mill?
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28th May 2020, 10:41 PM #5Golden Member
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There are 2 options for grinding the spindle taper: TPG spindle vertical, with milling head tilted to 1/2 of the angle of the taper and traverse using the knee or TPG spindle horizontal, with milling head tilted 90 degree minus 1/2 of the taper angle and traverse with the x axis of the table. I won't know which method to use until I actually start setting up.
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31st May 2020, 10:28 AM #6Golden Member
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Before using the TPG on the Surface Grinder I had to "touch up" the base of the casting to make it parallel with the spindle centre line as it was about .012" out over 4 inches. The photo shows the ground and unground areas after removing about .006".
Waldown TPG Base.JPG
Waldown TPG Base 2.JPG
I also ground a Reference Face for easy set up.
Waldown TPG Reference Face (2).JPG
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17th Aug 2020, 11:12 PM #7Golden Member
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I have decided to try grinding the milling machine spindle taper on the lathe rather than in head of the mill, hopefully I will have more control and visibility this way. This has been a big job to set up correctly so I hope everything goes smoothly, I only need to remove about .002" to clean up wear and slight runout.
Beaver Spindle (2).JPG
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18th Aug 2020, 09:40 AM #8
I know you have gone to a lot of work, but that would have been more accurate to take the spindle apart and bearings off.
If you chuck up the top bearing journal accurately in the lathe, then use a steady rest on the bottom bearing journal to do your grinding.
All bearings have some runout, so doing it the way you are is going to grind your bearing runout into your spindle, and it will move with each rotation as the balls move around.Using Tapatalk
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18th Aug 2020, 09:47 AM #9Golden Member
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The spindle is fitted with a Duplex pair of precision angular contact bearings, not your average run of the mill general purpose bearings. The method I am using is similar to the way spindle tapers are ground in situ by various companies, mainly in the USA, there are lots of you tube videos showing this process.
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18th Aug 2020, 10:12 AM #10
Fair enough, I thought it was a bench top mill or similar type.
I have seen over the years of that being done to Bridgeports etcUsing Tapatalk
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19th Aug 2020, 10:46 AM #11Golden Member
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The spindle is driven by an "o" ring which seems to do the job quite well, although I can stop it rotating by hand. Hopefully the small grinding wheel spinning at high speed and light cutting pressure will not make the drive slip.
o ring drive (2).JPG
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21st Aug 2020, 12:15 AM #12.
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Nice work Lex.
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22nd Aug 2020, 10:15 PM #13Golden Member
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The many hours spent getting the Spindle and TPG set up correctly paid off with the actual grinding being all done in about half an hour or less.
Here's a link to a YT video showing the run out at about .003mm from the original TIR of about .025mm before grinding.
https://www.youtube.com/watch?v=_1Nuo3_q0Qk
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23rd Aug 2020, 08:57 AM #14Golden Member
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Top job mate. Very well done.
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23rd Aug 2020, 11:23 PM #15Golden Member
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Today I decided to try for a better finish on the taper by using a different grade of wheel (38A80---), the results were very good
Ground Finish (2).jpg
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