i have an xtra 16/32 gear available ...pressure angle shud be 14 1/2...Brits like 20 deg., dont need to undercut small # teeth gears... best...
78854
gennady_123
Aug 5, 2012 7:48 pm
Jon, To avoid keyway problem, the dead center can be inserted in TS and you can indicate it as close to the quill as you wish. Or, even simpler, you can...
78855
John
k1929x
Aug 5, 2012 7:58 pm
Hi Gennady, You are absolutely correct it is a lot easier however it is far less accurate. To prove my point put a 1-1/2 or 2" scrap bar hanging 6 or 8"...
78856
John
k1929x
Aug 5, 2012 8:05 pm
Hi Gennady, Yes it is OK t read front to rear on a horizontal appilcation but the up & down reading can not be relied upon to be accurate. Best Regards,...
78857
jrd77vet
Aug 5, 2012 8:36 pm
I'm selling the gears I got last month. Here's a write up with pics http://www.machinistweb.com/forum/showthread.php?t=2187 There is also a belt, Clausing...
78859
gennady_123
Aug 5, 2012 10:10 pm
John: Yes, you may be right. Just for the reference, to be sure we are talking about the same thing, here is what prompted my suggestion ...
78860
anthrhodes@...
anthrhodes
Aug 5, 2012 10:21 pm
Gennady, Actually, while it might be a moot point, you're measuring the wrong thing. You're not interested in the OD, you're interested in the bore. You could ...
78861
John
k1929x
Aug 5, 2012 10:50 pm
Hi Gennady, Thanks for getting back to me! Had a new computer installed 3 months ago & have had no vido since I will look into the Tubalcain set upas soon as I...
78862
Jon Elson
jmelson2
Aug 5, 2012 10:58 pm
... I think you will have to carefully examine it as it is jamming up. Have you determined the jamming is happening in the reversing gearbox? Or, could it be...
78863
Jon Elson
jmelson2
Aug 5, 2012 11:08 pm
... Certainly, some mediocre indicator mounts are awful, but a well-made magnetic mount with a flat bottom, or a bar held in the chuck, will not sag enough to...
78864
Jon Elson
jmelson2
Aug 5, 2012 11:10 pm
... Yes, this is a good point. No easy way to know how accurate the ID / OD alignment is. Measuring the inside of the taper is harder, but can be done with ...
78865
John
k1929x
Aug 5, 2012 11:19 pm
Hi Anthony, I have to take exception to your view of the Atlas tailstock quill, even that the Atlas is not a Clone of a Monarch Lathe it was made in the US...
78866
gennady_123
Aug 5, 2012 11:23 pm
Fully agree!...
78867
Guenther Paul
paulguenter...
Aug 6, 2012 1:06 am
If the truth is said. With the tail stock a bit higher or lower it will not create a taper cut between centers. I don't believe any make lathe has a perfect ...
78868
Guenther Paul
paulguenter...
Aug 6, 2012 1:11 am
If you all are so concerned about accuracy on a flat bed Atlas lathe and are trying to machine perfect parts. I would recommend to buy a better and more...
78869
geoffrey_in_thailand
geoffrey_in_...
Aug 6, 2012 1:20 am
Dear Robert, What is the sine bar method? How can a sine bar be used to measure tailstock offset?...
78870
jerdal@...
jtiers
Aug 6, 2012 1:56 am
True, but since they SHOULD be concentric, it should not matter which you measure. if either is wrong, there will likely be an issue. JT ... From:...
78871
wa5cab@...
wa5cab
Aug 6, 2012 3:00 am
Dan, I don't actually know the genesis of the term, nor understand why the name is appropriate. But a sine bar is (should be) a precision (i.e., perfectly ...
78872
Russ Kepler
rkepler007
Aug 6, 2012 4:28 am
... I've never heard that called a "sine bar" but instead a "parallel test bar". I have seen sine bars used on lathes to set up tapers, but that's about it. ...
78873
wa5cab@...
wa5cab
Aug 6, 2012 4:41 am
OK. Then obviously the one we are talking about is a zero degree sine bar. In a message dated 08/05/2012 23:28:12 PM Central Daylight Time, ... Robert Downs -...
78874
Clive
cliveadams79
Aug 6, 2012 6:51 am
Thanks for your reply, Jon. Well, I can tell you right here and now without even looking that it's not the cross-feed mitre gears in the carriage - there...
78875
Paul
phowell_7
Aug 6, 2012 11:42 am
Another easy option is to use a coaxial indicator if you have one. http://www.youtube.com/watch?v=tJrPLOq1T6A Paul H....
78876
geoffrey_in_thailand
geoffrey_in_...
Aug 6, 2012 1:10 pm
Dear Robert, Thanks for the explanation. I like the method and might try it. I would call the bar a "round tail stock alignment bar" and not a sine bar. I've...
78877
wa5cab@...
wa5cab
Aug 6, 2012 2:53 pm
OK. Whatever its proper name is, and I guess "tailstock alignment bar" is logical, if you have a good one, it's more convenient than turning each end of a...
78878
Jon Elson
jmelson2
Aug 6, 2012 4:06 pm
... Umm, no, not even close. Do a google search on "sine bar" and you will see pictures of a flat ground bar with two round, ground pins near the ends. These...
78879
anthrhodes@...
anthrhodes
Aug 6, 2012 4:08 pm
John, I'm really not in opposition to what you say here. You may have noticed my closing remarks were "--- just on general principles." It's always best to ...
78880
gennady_123
Aug 6, 2012 9:28 pm
Paul, I have suspicion that it will cut if not taper in the sense, but, at least, something different from perfect cylinder. If you have tailstock elevated,...
78881
Guenther Paul
paulguenter...
Aug 7, 2012 1:15 am
Gennady If your tail stock is higher and i don't believe it is if you have the original tail stock. It may be lower from wear but so little it wont matter....
78882
Jon Elson
jmelson2
Aug 7, 2012 1:29 am
... Vertical errors on the tailstock make relatively small errors in the turned diameter. The larger the workpiece diameter, the smaller the error. You can...
78883
wa5cab@...
wa5cab
Aug 7, 2012 4:52 am
Group, I wrote this up this evening, spending more time on it than I had intended. If anyone can spot any gross error I made, please point it out so that we ...
