Re: Ball Screw Machining

My experience with the same material is that it tends to be air hardening. I
tried heating to an orange red and letting air cool very slowly and the
screw stock ended up even harder than I began and now it was hard all the
way thru!!

I ended up machining ends from some rolled steel rod I had handy and tig
welded then onto the ball screw stock.

See my web page at http://www.ktmarketing.com/ballscrew.html for a longer
version of the story.

Tim
[Denver, CO]

----- Original Message -----
From: John Ross <johnr@...>
To: <CAD_CAM_EDM_DRO@...>
Sent: Thursday, July 01, 1999 2:20 PM
Subject: [CAD_CAM_EDM_DRO] Ball Screw Machining


> From: John Ross <johnr@...>
>
> Hi I'm new (as of today) to this list, and I have a question about
> machining hardened ball screws. I have been converting my Mill Drill to
> ball screws as the article in HSM. Dan Falck has been giving me some
advice
> on how he did this conversion. As Dan had did on his conversion I heated
> the ball screw in a lathe at its slowest speed (60 RPM), to a Straw color
> then let it cool before machining them. They are still extremely hard.
> I've tried reheating them but have had no better luck. Drilling the #7
> hole for a 1/4 20 center screw was darn near impossible and my tap won't
> even start to cut a thread. The ball screws I'm trying to use are from
> McMaster Car and they list them as "induction hardened to Rockwell
56-60C".
> Does anybody have any ideas as to how to soften these up so I can machine
> these beasts. My fathers suggestion to grind them is a little pricey
> considering I don't own a tool post grinder.
>
> John Ross
>
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