Good Morning Bob:
Here is what I have so far: Stock is 3/4" 12L14, HSS 3/8" cutting tool - sharpened & honed, 3 jaw on hs and live center in ts. With stock either chucked or supported by ts, I have indicated top and rear of stock and corrected alignment using shims between the bed and bench. Bolts are snug, but not tight to permit adjustment if required. Whether the stock is held with just the 3 jaw, or supported with the ts, the lathe still cuts a taper towards the hs in the neighborhood of .02". I am using a Starret square base to level the unit fore/aft and side to side. All readings using the level are dead center, with no parallax error (all readings taken from top dead looking down at the vial). Should I invest in a more precise level to ensure these reading are true? I have checked for alignment at the hs, center of the bed and ts areas. While it has been several years since I have used a lathe, am I overlooking something minor here? All carriage and compound gibs are properly adjusted and lubricated. While cutting, I have used several fluids with the same results: WD40, 10W oil with STP, and even kerosene. Are these lathes that far out of alignment from the factory, or is this due to shipping/handling? There was no damage to the carton or the lathe when received, and I wonder if this unit should be returned for a new one. While I am not opposed to making corrections/adjustments to get acceptable results, this has been quite perplexing, to say the least. Best regards, Nick
Bob Sunley <rosunley@...> wrote:Check list time:
What are you cutting, type of metal/plastic, diameter and length.
How is it chucked, 3 jaw, 4jaw, between centers or combination.
Type of cutter, hss, carbide, a u-grind or factory insert.
Speed setting, power or manual feed.
Chattering and cutting tapers are two totally different problems.
Which do you want to fix first.
Cutting tapers can indicate a warped bed or tailstock not set
properly depending on how you are holding the workpiece.
which way is the taper?
Chattering can be any number of problems, wrong/no cutting lube,
wrong feed rate, tool height set wrong, wrong type of tool, too fine a
cut, too agressive a cut, assorted gibs not adjusted properly, etc.
etc, etc.
Solidly mounting the lathe can cause tapered cuts as well if it warps
the lathe bed
Need lots more info on exactly what you are doing.
Bob
On 9 Dec 2002, at 21:23, ntdefeo ntdefeo@... wrote:
After setting and checking my Homier 7X12 lathe 9 ways to sunday, I
am still turning tapers! As carriage is advancing towards the hs
assembly, the hs cutting tool starts to chatter, no matter what
adjustments are made. Is it possible that the bed it bowed/warped in
such a manner that this machine should just be returned for a new
unit? I have never run up against such a perplexing problem. All
adjustments have been checked and rechecked for accuracy. Unit is
solidly mounted on a bench. Has anyone else run across this problem?
Any comments? suggestions? short of heaving it into the trash?
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