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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Stretched the tailstok ram
The ram wouldn't retract more than about halfway.
I took it all apart, looked for debris saw essentially none but cleaned anyway, stoned the edges of the keyway, it still started to stick about halfway. I was sure I hadn't bent it or anything... The chuck taper was still in the ram, good and tight; popped that out and no stick. Last drilling job was pushing a Forstner bit through plastic pipe to make it a little bit bigger ID. I guess it got hot, the ram grew, the taper went in more. |
#2
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Stretched the tailstok ram
"xpzzzz" wrote in message ... The ram wouldn't retract more than about halfway. I took it all apart, looked for debris saw essentially none but cleaned anyway, stoned the edges of the keyway, it still started to stick about halfway. I was sure I hadn't bent it or anything... The chuck taper was still in the ram, good and tight; popped that out and no stick. Last drilling job was pushing a Forstner bit through plastic pipe to make it a little bit bigger ID. I guess it got hot, the ram grew, the taper went in more. Look for galling along the quill OD where the lock mechanism comes into contact with it and stone again.....install and test fit...any raised areas will present as shiny in appearance rather than dull...repeat if needed. |
#3
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Stretched the tailstok ram
xpzzzz wrote:
Last drilling job was pushing a Forstner bit through plastic pipe to make it a little bit bigger ID. I guess it got hot, the ram grew, 'Makes no sense. How would the ram get that hot from a chucked-up bit on the end of an arbor? I had a similar problem that got worse and worse on my ShopFox 14x40. It turns out, they must've bored the ram bore in the cheeze-metal casting before they did the other machining, or maybe before the casting aged enough to stop changing shape. Hell, they might even have bored with a dull tool, and gotten the work too hot. But in any case, the bore wasn't straight, and the ram was. I carefully reamed it about 1/2 a tenth, and it moves OK now, and tracks -- eh... OK. I'll probably sleeve it at some point, if the walk in the tip (while extended) becomes an annoyance. LLoyd |
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