Seadog
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You can turn carbide with cbn tips
Which suprised me when I tried it!
You can turn carbide with cbn tips
Which suprised me when I tried it!
Is it possible to tap a thread into the end of the hardened steel shaft instead? I.e. a blind hold parallel to the length of the shaft so I could bolt something onto the end of it instead.
Another options could be an aluminium shaft (EN AW 6061/6060) but I'm guessing steel would be better for the application below (wheel truing jig).
Or the spec on the retail unit is hyped up to entice the trendysThe topic has followed the how to machine hardened steel but as the OP started the thread with:
Would a reasonably tough yet machinable steel not be a good compromise? Almost anything machined from one piece would be more accurate than the commercial product shown in the original post which appears to be steel cones located in a steel tube with a M6 (?) locking screw.
As a shed engineering newbe EN8 steel, 303 stainless or silver steel is what I would be experimenting with.
I was just wondering if the more experienced machinists have gone down a rabbit hole of exotic materials.
Not if it is through hardened you just can't. You can mill a thread using a special CBN threading tip, but you need a CNC Mill for that. Or you could EDM it, both of these options are not cheap.
Its for truing bicycle wheels? Aluminium will be fine.
/QUOTE]
Yes, it is, many thanks. Almost there figuring out everything I need. Will deffo need to get someone to machine a few bits for me so will be back shortly to see if anyone is interested. Cheers all.
You used the sae number 4140 (en19) been watching too much abom79Likewise I rescued some BMW propshafts from a scrap bin a couple of months ago.
Stiff enough to turn without a travelling steady.
...to give a surprisingly good finish with a relatively aggressive feed rate.
Very decent material. Bit "chewy" and I think most likely case hardened rather than through hardened but if you go through the outer crusty layer in one pass, easy enough to machine. Difficult to determine exactly what it is but istr I decided it was something like 4140.
You used the sae number 4140 (en19) been watching too much abom79
A lot of shafts are en24 ( 4340)
I have come across en16 shafts on old stuff.
Have to admit I prefer sae or en designation cos I cant remember those ansi numbers