DOC with older Grizzly (G1002)?

[daved20319b]

AKA the 1224G I believe. 80's vintage, 12 x 24 belt drive, made in Taiwan. Although I've had this machine for awhile, I never did a lot with it, but my circumstances have changed and now I'm focusing on my machining again. Recently did a 3 phase conversion, I made a silly mistake early on, but that's now sorted. But I'm still struggling with feeds, speeds, and DOC with this thing.

So for those of you running this machine or the nearly identical 36" version, what's your max DOC, and at what speed and feed? Cutter info would also be helpful, I mostly use HSS, but I also have some carbide, although nothing exotic. I'm mostly concerned with steel at this point, my previous use was almost exclusively aluminum and plastic, but I'm planning to do more with steel going forward.

And before anyone tries to ding me for not doing my own research, yes, I know about SFM, the rule of thumb formulas, and I've got lots of charts. I even know that they're all more or less based on the data from the Machinist's Handbook. What I'm after here is real world use with machines the same as mine, or at least close. I don't feel like I'm getting the performance from this machine that I should be, but all I have to compare it to is YT vids, so I'm looking for a reality check to determine if my expectations are reasonable or not. Thanks!

Dave

 

[mmcmdl]

Experiment with the lathe . Too little info here . HP ? Tooling ? Material ? Set-up ? Can you be more specific ?

 

[DavidR8]

I have a similar machine, a Grizzly DF-1237G with a 1.5HP motor. With a sharp HSS tool I can take a .030 DOC in steel but I don't typically push it that hard as I don't feel the need.
Can you describe what you're experiencing?

 

[daved20319b]

Experiment with the lathe . Too little info here . HP ? Tooling ? Material ? Set-up ? Can you be more specific ?

Appreciate the response, but did you actually READ my post? My question wasn't about MY setup, I was asking people that own the same or very similar machines what THEIR setup is. Yeah, experimenting is exactly what I've been doing, with some satisfactory results, and some not so much. This is the only lathe I've owned or run, and I've never had any formal training in machining, so I really don't know what this class of machine is capable of.

So to reiterate and clarify. I'm not looking for a tutorial on how to set up my machine, or how to determine feeds and speeds. I'm looking for info on what folks that own the SAME machine have been able to do. Hope that clears up any confusion, and thanks again.

Dave

 

[daved20319b]

I have a similar machine, a Grizzly DF-1237G with a 1.5HP motor. With a sharp HSS tool I can take a .030 DOC but I don't typically push it that hard as I don't feel the need.
Can you describe what you're experiencing?

THAT'S the info I'm looking for ! Mind if I ask what your feeds and speeds are? Mine also has a 1.5 HP motor, although as I said in my first post, I recently converted it to a 3 phase motor and VFD. .030" in mild steel also feels like about as hard as I can push mine, but I had it in my head that I should be able to do more. I'm also not getting very good chip formation, but that's likely a much my (poor?) technique as anything else. Probably watching too many YT vids, I see folks running lighter, less powerful machines, taking .050" passes at high speeds, and still getting a nice surface finish. I know, YT is usually NOT the right place to go, but I live in the boonies, I don't have a lot of options. I'm also pretty selective about who I decide knows what they're talking about, and who are the wannabes, but it's still a crap shoot .

So basically, I'm getting poor surface finishes unless I dial everything way back, poor chip formation, and the machine bogs down noticeably under cutting loads. I don't remember it doing that before, but I also never really pushed it before, most of my previous use was plastics and aluminum. Appreciate the info, thanks.

Dave

 

[mmcmdl]

Appreciate the response, but did you actually READ my post?

I read your post and really not what information you're looking for . DOC , feeds and speeds etc . The handbook is only a starting point FYI and not the Bible . I've owned 15 different 12" lathes over the years all with different capabilities . You have to find out what YOUR machine is capable of with YOUR tooling etc . The only way to find whatever results is for you to experiment . Try taking a .030 DOC as Dave stated above , see how the machine reacts . If it works , try bigger , if it doesn't go smaller .

I was asking people that own the same or very similar machines what THEIR setup is.

Their setup is not YOUR setup , so their results may not be the same as YOURS . This is a learning process .

 

[DavidR8]

I run my machine very conservatively. I honestly don't remember the speed or feed rate.
I will check later today and snap a pic of the resulting cut.

 

[jarhead]

I think it was a legitimate question about HP, tooling, etc, etc.

in order to make a comparison it would be helpful to know what you are using in order to compare apples to apples.

Otherwise we might have more HP, less HP, using HSS vs carbide, etc, etc

EDIT, i see several similar responses that werent there until i refreshed the page. Not trying to be a smart @zz

 

[Pevehouse]

I also have the encore version from the 80s. Love this machine. She is extremely accurate or at least mine is. I also can take .030 to .040 DOC

 

[Pevehouse]

Also my machine is a 1 hp but I’m in the process of installing a 2hp motor