Tool post grinder build Clough42 inspired

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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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