Search found 99 matches

by roundnose
Tue May 07, 2013 10:27 pm
Forum: General Discussion
Topic: Some info on high accuracy machining
Replies: 3
Views: 935

Re: Some info on high accuracy machining

Perhaps, I was not clear enough. So, with a jigborer or toolroom lathe using those methods under those ideal conditions, one possibly could hit 79 millonths of a target size. That said, under less then ideal conditions, and perhaps worn, or otherwise lesser machines, one could hit- say 4X that, ever...
by roundnose
Tue May 07, 2013 12:48 am
Forum: General Discussion
Topic: Some info on high accuracy machining
Replies: 3
Views: 935

Some info on high accuracy machining

This is sure to PO some but, it does exist. This is really old hat, but the methods being printed out is really not common. Often touted as not possible, cant be measured, but in reality has been done for decades by the most skilled craftmen. I have had these boring heads for around 20yrs, using the...
by roundnose
Mon May 06, 2013 9:55 pm
Forum: General Discussion
Topic: self-sharpening setup for wood planer
Replies: 20
Views: 3186

Re: self-sharpening setup for wood planer

Unfortunately cutter heads are not easy to remove from planers. A few months ago I found a Powermatic 160 16" planer, vintage 1959, near mint condition from a Montana school. The machine had the Esta dispozAblade system installed, but never used, with a dozen extra blades. A grinder set up is an opt...
by roundnose
Mon Apr 01, 2013 12:40 am
Forum: Lathes
Topic: wobble in lathe
Replies: 15
Views: 2459

Re: wobble in lathe

I suppose slots can become too worn, I just have not come across it. Though, some chucks are looser in the jaw slots then others, rotating the work when clamping seems to make that not a problem. This chuck, a Buck 6"-6jaw is one of the most worn I have came across. A Hanford surplus, removed from a...
by roundnose
Sat Mar 30, 2013 10:59 pm
Forum: Lathes
Topic: wobble in lathe
Replies: 15
Views: 2459

Re: wobble in lathe

In 4 decades, and rebuilding dozens of scroll chucks, just never seen worn out jaw slots, or worn out scrolls. Even on chucks used on grinders. Some chucks do have looser slots then others however. I read that all the time from people that have never rebuilt chucks. Two bad things happen from wear, ...
by roundnose
Fri Mar 29, 2013 10:48 pm
Forum: Lathes
Topic: wobble in lathe
Replies: 15
Views: 2459

Re: wobble in lathe

Google "grinding lathe chuck jaws" there are some videos about, good for the basic idea. This is one of the very odd things many machinist have a mental block over. There are better ways to load the jaws that seem to be shown on the videos. Who knows, maybe you might want to rebuild scroll chucks, a...
by roundnose
Wed Mar 27, 2013 10:47 pm
Forum: Lathes
Topic: Who uses tool post grinders?
Replies: 10
Views: 2307

Re: Who uses tool post grinders?

Soft jaws, very handy on scroll chucks. I was refering to close tolerance work with 4jaw chucks, Where as the chuck jaws ground in place on the machine for full work contact, and once clamped and trued, the work piece also running true at distance from the jaws. This eliminates using soft pads on th...
by roundnose
Wed Mar 27, 2013 1:32 pm
Forum: Lathes
Topic: Who uses tool post grinders?
Replies: 10
Views: 2307

Re: Who uses tool post grinders?

A needed evil to get the most out out of a Monarch 10EE lathe. This is why, the best results using "jaw chucks" is with 4jaw chucks. The chuck must hold a test bar at least 8" out from the jaws true. Otherwise, there will be bind with the tail center "unless the part was center drilled when extended...
by roundnose
Sun Mar 17, 2013 5:43 pm
Forum: General Discussion
Topic: Boring Engine Cylinders
Replies: 19
Views: 3722

Re: Boring Engine Cylinders

Glenn is right on with the Sunnen AN hand hone. Back in the days of real sport, Harley Davidson recomended their cylinders be done that way. Many reasons why, this is some. The cylinder base flange was made true to the bore at the factory. The typical small boring bars a MC shop would have are proba...
by roundnose
Sat Mar 09, 2013 12:06 pm
Forum: Lathes
Topic: Cutting Left Hand Threads
Replies: 10
Views: 1204

Re: Cutting Left Hand Threads

This was a fun project for me. I found a Delta Rockwell 12/14" table saw. This saw has changeable blade arbors, where most any blade hole size can be adapted with sized arbors. No longer produced, no parts available, when they were, the arbors were spendy, the blade nut alone was over $100. Only hav...
by roundnose
Mon Feb 11, 2013 5:35 am
Forum: General Discussion
Topic: Tree taper boring tool
Replies: 6
Views: 1747

Re: Tree taper boring tool

The knurled collar at the top of the tool is graduated, when the slide is set to 90 of the spindle, bore size can be adusted. That is the same collar that is hand held for taper boring, facing etc., while the head is in motion. There are two versions of the head, slow feed, and fast feed. I found th...
by roundnose
Wed Sep 14, 2011 5:25 pm
Forum: General Discussion
Topic: Baffled..On a Stupid Puzzle
Replies: 30
Views: 4586

Re: Baffled..On a Stupid Puzzle

Even on my grinding machines that use Sopko type removable hubs, and toolroom wheels, there is always run-out. I have a Jet 8" bench grinder, other then putting new bearings in it, its been pretty good. The smaller hub size, stamped flanges, and probably less precision made wheels, there is more run...