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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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Advice needed on replacing spindle bearings in Enco Mill Drill
I have a well used Enco Mill Drill which is made by Rong Fu in Taiwan. I
think it's the model RF-20. The spindle on it has a bit of play and tends to produce lots of harmonics and chatter when boring or using the side of an endmill to cut. I don't know much about these so this may be something that can be addressed by turning a spanner, or maybe it needs new spindle bearings. If anyone has had to correct this on one I'd really appreciate any input on what the cause usually is and how to go about fixing it. Thanks, Michael. |
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Advice needed on replacing spindle bearings in Enco Mill Drill
"Michael" wrote in message
... I have a well used Enco Mill Drill which is made by Rong Fu in Taiwan. I think it's the model RF-20. The spindle on it has a bit of play and tends to produce lots of harmonics and chatter when boring or using the side of an endmill to cut. I don't know much about these so this may be something that can be addressed by turning a spanner, or maybe it needs new spindle bearings. If anyone has had to correct this on one I'd really appreciate any input on what the cause usually is and how to go about fixing it. Thanks, Michael. I have the identical machine, made in 1992. I think the spindle bearings are ordinary ball bearings, like standard sealed electric motor bearings - nothing exotic. In the realm of $50 for an identical Chinese replacement. That said, the quill bore is likely to wear faster than the bearings. Do you do all side cutting with the quill securely locked? When boring, the quill lock should be cranked enough to drag. Accelerates wear but improves the finish. It's also possible that the upper spindle bearings are at fault, as they take the side load of the belt but are not as beefy as the spindle bearings. The table ways/gibs are also pretty rough, I found it difficult to get a perfect gib adjustment and so have always cranked the gib locks until the table drags a bit when making a finish cut. Again, accelerates way wear but improves finish. Goes without saying whichever axis is not moving should have its gib locks tight. For boring, both axes. Bob |
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Advice needed on replacing spindle bearings in Enco Mill Drill
"Bob Powell" wrote in message
s.com... "Michael" wrote in message ... I have a well used Enco Mill Drill which is made by Rong Fu in Taiwan. I think it's the model RF-20. The spindle on it has a bit of play and tends to produce lots of harmonics and chatter when boring or using the side of an endmill to cut. I don't know much about these so this may be something that can be addressed by turning a spanner, or maybe it needs new spindle bearings. If anyone has had to correct this on one I'd really appreciate any input on what the cause usually is and how to go about fixing it. Thanks, Michael. I have the identical machine, made in 1992. I think the spindle bearings are ordinary ball bearings, like standard sealed electric motor bearings - nothing exotic. In the realm of $50 for an identical Chinese replacement. That said, the quill bore is likely to wear faster than the bearings. Do you do all side cutting with the quill securely locked? When boring, the quill lock should be cranked enough to drag. Accelerates wear but improves the finish. It's also possible that the upper spindle bearings are at fault, as they take the side load of the belt but are not as beefy as the spindle bearings. The table ways/gibs are also pretty rough, I found it difficult to get a perfect gib adjustment and so have always cranked the gib locks until the table drags a bit when making a finish cut. Again, accelerates way wear but improves finish. Goes without saying whichever axis is not moving should have its gib locks tight. For boring, both axes. Bob Sorry, I just RTFM'd a bit late. Oops. According to the manual they are grease-packed taper roller bearings, the upper is a 30205J and the lower is an E30206J. Adjusted by a pair of locknuts at the top of the quill. The manual says to loosen the bearings if they run too hot, tighten if the surface finish is "rough". It doesn't say how, but it looks like you remove the rack pinion (i.e. the quill feed shaft) and the quill just drops out the bottom of the head casting. I don't know if you can get to the bearings via any of the access plates, may just have to remove the quill. I can say from other experience, if the quill doesn't heat up when running at top speed, the bearings are too loose. Mine has behaved so consistently, I never would have guessed taper roller bearings. Bob |
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Advice needed on replacing spindle bearings in Enco Mill Drill
If you don't have a manual to look at, the last time I looked a number
of the Enco manuals could be downloaded from their web page. It's at "goenco.com" or something like that. Dick Morris Anchorage, Alaska On Tue, 30 Mar 2004 21:56:19 -0600, "Michael" wrote: I have a well used Enco Mill Drill which is made by Rong Fu in Taiwan. |
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