Search found 116 matches

by KellyJones
Sun Jun 23, 2019 6:34 pm
Forum: Lathes
Topic: Threading
Replies: 13
Views: 5547

Threading

Thought I would share an experience I had this week. I am by no means an expert in machining. Although I've had my Grizzly G4003 lathe for almost 15 years, I am still very much a newbie. For instance, I have only threaded on my machine one time before this week. Earlier this spring, while readying t...
by KellyJones
Sat Dec 15, 2018 11:49 am
Forum: Milling Machines
Topic: Diagnosing a Milling Machine problem
Replies: 26
Views: 8821

Re: Diagnosing a Milling Machine problem

Thanks all for the thoughtful replies. I found it helpful.
by KellyJones
Fri Dec 14, 2018 2:01 pm
Forum: Milling Machines
Topic: Diagnosing a Milling Machine problem
Replies: 26
Views: 8821

Re: Diagnosing a Milling Machine problem

After responding to Harold, I started thinking about this. I took some photos of the end mill. There is some evidence of contact behind the cutting surface (the relief?) and some evidence of chipping and cratering of the edge. Didn’t notice before because my eyes are not what they once were.
by KellyJones
Fri Dec 14, 2018 1:48 pm
Forum: Milling Machines
Topic: Diagnosing a Milling Machine problem
Replies: 26
Views: 8821

Re: Diagnosing a Milling Machine problem

Harold You got me. I'm not sure what you mean be "making contact at the primary relief". (Newbie, remember? :D ) I think you mean that then entrance to the ID of the collet there should be a relief? and the EM is contacting there? OR are you referring to the relief on the flute of the EM? I can see ...
by KellyJones
Wed Dec 12, 2018 10:10 pm
Forum: Milling Machines
Topic: Diagnosing a Milling Machine problem
Replies: 26
Views: 8821

Re: Diagnosing a Milling Machine problem

I did check the end mill by setting it on a V-block and rotating it under a test indicator. No discernible out of roundness of the EM. I also checked it for size. I am a relative newbie to the hobby, although i got my lathe nearly 20 years ago, and the milling machine nearly 15 years ago. Can't say ...
by KellyJones
Sun Dec 09, 2018 7:19 pm
Forum: Milling Machines
Topic: Diagnosing a Milling Machine problem
Replies: 26
Views: 8821

Re: Diagnosing a Milling Machine problem

Too soft? I’m still trying to figure that one out. Maybe. I can see if it was too hard it wouldn’t flex enough... There are witness marks in the collet and on the OD of the cutter, but not vertical. There is evidence the tool has spun a little, but not much. I also notice that this cutter in this pa...
by KellyJones
Sun Dec 09, 2018 4:56 pm
Forum: Milling Machines
Topic: Diagnosing a Milling Machine problem
Replies: 26
Views: 8821

Re: Diagnosing a Milling Machine problem

Given what I’m seeing, that has the ring of truth to it. Can’t get to it from outside. Need to figure out how to get to it.
by KellyJones
Sun Dec 09, 2018 3:18 pm
Forum: Milling Machines
Topic: Diagnosing a Milling Machine problem
Replies: 26
Views: 8821

Re: Diagnosing a Milling Machie problem

Took the setup down and cleaned an measured everything. No debris, tools are the size marked. Found a small dent in the end mill. Looks like it came that way as it appears to have TiN coating in it. Found no burrs in the collet or spindle. Lubricated the draw bar and the threaded end of the collet. ...
by KellyJones
Sun Dec 09, 2018 2:04 pm
Forum: Milling Machines
Topic: Diagnosing a Milling Machine problem
Replies: 26
Views: 8821

Re: Diagnosing a Milling Machie problem

Don;t think i have any metric tools. At least they are all marked in imperial units. I will check though, just to be sure. I also checked for chips in the slots. Everything looks clean. I am cutting with the side of the mill. The cut is about .050" into the side of the cutter and .525 along the leng...
by KellyJones
Sun Dec 09, 2018 1:27 pm
Forum: Milling Machines
Topic: Diagnosing a Milling Machine problem
Replies: 26
Views: 8821

Diagnosing a Milling Machine problem

Hi folks. Been a while since i posted. I could use some advice. I have a Grizzly G3617 milling machine that's giving me some problems, and i'm not sure if it's operator error, or a problem with the machine. I'm trying to mill a part with a 4 flute 5/8" diameter end mill mounted in an R8 collet. The ...
by KellyJones
Sat Sep 22, 2018 9:29 am
Forum: General Discussion
Topic: Metalllurgy question
Replies: 9
Views: 1893

Re: Metalllurgy question

2024 (and other aluminum alloys) are precipitation hardening. That means given temperature an time, alloying elements will migrate within the metal and form tiny clumps, which strengthen the alloy. Some alloys do this at room temperature. The upshot is, that unlike some CRES alloys, aluminum alloys ...
by KellyJones
Thu Sep 15, 2016 10:00 pm
Forum: General Discussion
Topic: MSC-Enco Transition - Quality-service-price-etc.
Replies: 9
Views: 1779

Re: MSC-Enco Transition - Quality-service-price-etc.

I dunno. Had to replace my 6 inch dial calipers recently. My old ones were from Enco and cost about $36. Not the highest quality, but felt good to use and serviceable for my needs. Dropped them ( sad story) and had to replace them. The new MSC calipers, for approximately the same money, feel cheap a...