Search found 129 matches

by KellyJones
Tue Jan 18, 2011 3:50 pm
Forum: Lathes
Topic: Attention Newbies: Don't do this!
Replies: 3
Views: 1459

Re: Attention Newbies: Don't do this!

Ken: I certainly thought about it, and still might. In my field we consider that only the first three threads carry any meaningful load, and this nut had about 12 full threads to start with. If we assume that it now has 10 full threads then I still have a factor of safety of over three. I haven't fi...
by KellyJones
Tue Jan 18, 2011 9:15 am
Forum: Lathes
Topic: Am I getting old?
Replies: 17
Views: 2667

Re: Am I getting old?

JackF:

I went to Fastenal. I had high hopes because they have a store in Everett.
by KellyJones
Mon Jan 17, 2011 3:10 pm
Forum: General Discussion
Topic: What is the best way to do this ???
Replies: 47
Views: 4163

Re: What is the best way to do this ???

I had the same problem as the original poster - trying to turn a 6" X 6" X 1" thick plate down to a 6" diameter flywheel. I couldn't get the thing to fit in the chuck, and the band saw seemed like it woudl take forever. I had tried clamping to a 1" diameter rod through the center with a .25" bolt, b...
by KellyJones
Sun Jan 16, 2011 5:06 pm
Forum: General Discussion
Topic: Involute Gear Cutting
Replies: 30
Views: 10728

Re: Involute Gear Cutting

Someone asked how the production guy cut gears:

http://www.youtube.com/watch?v=DwFssm9t ... re=related
by KellyJones
Sun Jan 16, 2011 4:57 pm
Forum: Lathes
Topic: Attention Newbies: Don't do this!
Replies: 3
Views: 1459

Attention Newbies: Don't do this!

Broke my lathe today. It started with a broken tap (different story). I have been hobby machining for about 5 years, so I have about a week's experience. :wink: I spent a couple of hours trying to extract the tap, and decided it was easier to just make a new part. Cut off a piece of 1" bar this morn...
by KellyJones
Thu Jan 13, 2011 3:05 pm
Forum: General Discussion
Topic: Involute Gear Cutting
Replies: 30
Views: 10728

Re: Involute Gear Cutting

Ahh! A question I can answer. First, realize that most high rate produciton shops use hobs to cut gears on gear cutting machines. The hob has teeth located around the OD in a spiral and the hob spindle is geared to the workpiece spindle through a selectable gear ratio. This means that for evey revol...
by KellyJones
Fri Jan 07, 2011 3:32 pm
Forum: Milling Machines
Topic: power feed adjustment
Replies: 1
Views: 1311

power feed adjustment

I have a Grizzly horizontal - vertical mill that came equiped with an Asong AS-235 power feed. The minimum speed is almost too fast for cutting steel. (It's nearly as fast as the rapid traverse speed at any setting above 2). I am having a devil of a time finding any information about how to adjust t...
by KellyJones
Thu Jan 06, 2011 2:56 pm
Forum: General Discussion
Topic: Hand Files
Replies: 10
Views: 2643

Hand Files

Can anyone explain the difference between a bastard and second cut file? What is the difference between a flat file and a mill file? I am thinking about buying some new files and it occurs to me that the standard off the shelf hardware store variety may not be appropriate anymore as I tend to use fi...
by KellyJones
Tue Jan 04, 2011 2:53 pm
Forum: Casting & Foundry Work
Topic: Heat Treating Oven
Replies: 17
Views: 6036

Re: Heat Treating Oven

Thanks for that Fender. I was gettign a little worried that I was doing something completely stupid using charcoal. Please also recall that the original post was about heat treatment, not melting. Having said that, how critical is it to use a diffuser in the fuel? Can I achieve 1650F by simply blowi...
by KellyJones
Tue Jan 04, 2011 9:16 am
Forum: General Discussion
Topic: Cutting the Picatinny
Replies: 7
Views: 3609

Re: Cutting the Picatinny

You are a real trooper to persevere with that drawing. If one of my engineers brought me such a poor layout I would have been upset. That is NOT how one dimensions a drawing, CNC or not. Some young engineers forget that the point of GD&T is to simplify communication with the shop, not show off what ...
by KellyJones
Mon Jan 03, 2011 9:07 am
Forum: Milling Machines
Topic: Beginner's Luck?
Replies: 12
Views: 2843

Re: Beginner's Luck?

The questions about cutter diameters and speeds got me thinking. The cutter is about 1.5" radius and I was running at 930 RPM. By my calculations that's about 730 FPM at the cutting tip. An old Machinery's Handbook says to cut steel between 90 and 120 FPM. I reground the tool bit and lowered the spe...
by KellyJones
Sat Jan 01, 2011 10:36 pm
Forum: Casting & Foundry Work
Topic: Heat Treating Oven
Replies: 17
Views: 6036

Re: Heat Treating Oven

Hmm... my post did not show up. Must be operator error. I'll try again, and hope it doesn't post twice. Did a postmortem on the oven today. Lots of unburned charcoal. A friend suggested I put way too much air in and did not allow for proper flow through the unit. The ball valve is not going to cut i...