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Tool post grinder build Clough42 inspired
PekkaNF:
--- Quote from: tom osselton on September 14, 2019, 07:29:55 PM ---A while back I went to get a motor for my Craftex mill and found out the spindles cost about $100.00 it is basically a rebrand of his mill in the videos.
--- End quote ---
??
Made a rookie mistake with the motor pulley. I got so distracted with the undersize 8 mm motor shaft dimession and decided to make it with a 8h7 reamer that seems to produce a little undersize hole. Well, pretty good size, but in a wrong place :doh: 0,04 mm of TIR.
6 mm boring bar just about fits into 8 mm hole, possible, but not ideal. But that is the way it has to be done.
I have three options, any other suggestions?
1: Use thin shim and bore the hole only 2xshim thickness bigger, Bit fiddly to fit.
2: Bore oversize hole into pulley, glue plug and bore correct diameter into that plug.
3: Make new pulley and not to cock it up this time.
Traditionally fixing a lemon takes only a little longer than to make it well.
Pekka
chipenter:
You could also mount the pully on a arbour and turn the exterior concentric .
philf:
Pekka,
There's another option.
Clean up the grooves concentric with the bore.
0.04 won't make that much difference to the ratio.
(Edit - have just seen that Chipenter has suggested the same fix.)
Phil.
PekkaNF:
Thank you. Good suggestion! I'll try that first - 8 mm arbor with M8 thread should be pretty easy to turn....now what was the lead I did last screw cutting? 1 mm/r :lol:
PekkaNF:
Busy day Yesterday, but managed to make a stub mandrell.
lathe change gears were at 1,0 mm lead and to avoid making a special nut I cut standard M6 thread. Hope that it still will pull the pulley tight enough to shave off a little from OD.
I used 55 degree insert for 6 mm spigot and thread and then cleaned upt the M6 thread with a standard die. Then I finished the mandrel diameter to pretty close 8,00 mm.
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