The Machine Work Thread

[jeff g]

Hi
Very nice work
jeff

 

[JTH]

Ez-duzit that's a great looking part. I'm going to purchase a small mill today and hope I can
Attain half your skills! You've given me a boost as I thought 60 was a little late to get busy on a new skill set!

 

[ez-duzit]

Thanks fellas.

JTH--good luck with your purchase. Try to find one with a bunch of tooling, not a bare machine.

 

[Jim Johnstone]

Just found this tucked away. It's one of my first projects from trade school.

 

[ez-duzit]

JJ--that should be displayed.

 

[Jim Johnstone]

JJ--that should be displayed.

Thanks. The funny thing is I didn't even keep the first die I built during my apprenticeship but I hung onto this little guy. Definitely going to keep it around my shop.

 

[Hephaestus29]

Does anyone have any idea what these
are and what they're for ?

 

[Hephaestus29]

Pics II

 

[cwh]

Looks like a henweigh.

 

[Hephaestus29]

Looks like a henweigh.

you mean
Like: what's a hen weigh ?

 

[EdT]

Perhaps trepanning tools for making a seat for an O-ring seal.

 

[cwh]

you mean
Like: what's a hen weigh ?

Sorry, couldn't resist....

 

[Jim Johnstone]

Maybe this doesn't count since it's not in my garage, but today I get to re bore a drive wheel from a bandsaw. This is one monster of a bandsaw apparently.

 

[nine4gmc]

Looks like it would be an awesome band saw!

Sent from my SM-T230NU using Tapatalk

 

[Jim Johnstone]

Looks like it would be an awesome band saw!

Sent from my SM-T230NU using Tapatalk

Yeah we do a lot of repair work for this company. They are a steel foundry/forge. I've heard their lathes/mills etc are absolutely massive.

 

[Nor'Easter]

I don't consider myself a machinist rather a fabricator with a knee mill... but these are some 6061 intake plates that fit a 6BT Cummins head.

 

[Hephaestus29]

Re: The Machine Work Thread Why is my boring bar double dipping on the backside cut?

So I was trying to use my boring bar "for the first time ever" as a fly cutter.

It was double dipping on the back side of the cut.

Do I just need to break down and get a face mill or what ?

What am I doing wrong ?

 

[Jim Johnstone]

Normally with a flycutter you want to very slightly tilt the head so the back sweep of the flycutter stays a few thou above the part. Even with a face mill and the head perfectly trammed, it's pretty common for the face mill to still cut a tiny bit on the back sweep.

 

[ez-duzit]

Fly cutters are cheap.

 

[Hephaestus29]

Ok thanks Like 5 degrees or ???

 

[Hephaestus29]

Fly cutters are cheap.

I've got 3 of those, not quite big enough plus I haven't learned to grind tools yet. I'd rather use an insert at this point.

 

[Hephaestus29]

Tilting the head might give you clearance
on the back side but it's going to dish
or concave the piece.

 

[Jim Johnstone]

Ok thanks Like 5 degrees or ???

Oh god no. Half a degree or less. Literally you only want a thou or two of clearance on the back sweep.

 

[Jim Johnstone]

Tilting the head might give you clearance
on the back side but it's going to dish
or concave the piece.

If it's setup correctly, it will be an almost immeasurable amount, this is SOP they teach in trade school for flycutting. Besides, if he is already having it cut on the back sweep and is "double cutting" with his current setup, then he is already dishing the part.

 

[Hephaestus29]

Thanks, I've been playing around trying to
set it up and, yes it looks like about a
half of a degree is going to get me clearance.

 

[Leveleer]

I enjoyed going through this thread. Lots of interesting skilled people.
Here is a picture I took while playing with some crankshafts I made on my Robodrill.

Frank

 

[A_Pmech]

An easy way to set this up is to put the indicator you use for tramming your machine into the spindle. Now, bring the machine a thou out of tram by loosening the head bolts until they're just snug and giving the head a few whacks with a rubber mallet.

Re-sweep the table with your indicator to confirm you have a thou tilt at the diameter of your fly cutter and go to town. I usually make the left side of the cutter low when viewed from the front of the machine. That way I don't get showered with chips.

 

[Hephaestus29]

Thanks everyone, I played around with it
further and yes, less than a half degree is
sufficient. I haven't tried your method yet
John but I will and I appreciate your input.

 

[Jim Johnstone]

An easy way to set this up is to put the indicator you use for tramming your machine into the spindle. Now, bring the machine a thou out of tram by loosening the head bolts until they're just snug and giving the head a few whacks with a rubber mallet.

Re-sweep the table with your indicator to confirm you have a thou tilt at the diameter of your fly cutter and go to town. I usually make the left side of the cutter low when viewed from the front of the machine. That way I don't get showered with chips.

Yep tramming indicator is the easiest way.

 

[Hephaestus29]

I enjoyed going through this thread. Lots of interesting skilled people.
Here is a picture I took while playing with some crankshafts I made on my Robodrill.

Frank

We have some Robo drills at work but they just use them for drilling oil holes in the drive hubs in our department.

What are those for lawn mowers Or ?

 

[Leveleer]

We have some Robo drills at work but they just use them for drilling oil holes in the drive hubs in our department.

What are those for lawn mowers Or ?

Oil free two stage direct drive air compressors.

 

[Hephaestus29]

I've got a Craftsman oil free unit that's been going strong for a good 15 years.

 

[Leveleer]

Some might find this interesting:

First machine I ever bought: Hardinge DSMA (purchased 1972)
First CNC machine: Spindle Wizard with 24 position tool changer (1976)
First CNC lathe: Okuma Howa 4PS (1977)
First multispindle screw machine: Acme Gridley RA6 (built 1942 to make 50 caliber bullets) purchased used for 6000 dollars in 1976.
Last multispindle: Guildemeister GM16AC
Last CNC lathe Guildemeister MF65-twin

Frank

 

[Hephaestus29]

Who knows what the torque specs are
after tramming a Bridgeport head?

 

[Jim Johnstone]

Who knows what the torque specs are
after tramming a Bridgeport head?

I usually torque it to precisely 3 EGU (elbow grease units).

 

[Hephaestus29]

Yeah, how big of a guy are you?
I'm just 5'6" so it might take more
egu's for me.

 

[Jim Johnstone]

Yeah, how big of a guy are you?
I'm just 5'6" so it might take more
egu's for me.

I'm 6'3" so your elbows may be calibrated differently.

 

[Hephaestus29]

Any experts here on Hardinge Lathes ?
And please don't tell me to go to yahoo
Hardinge groups, there may be a lot of
knowledgable people there but the site
*****.

I have a Hardinge Chucker I'd like to
get going but I have a couple questions
about it.

 

[longlivepunk]

I feel your pain with the Yahoo groups. Awful format. You might try e-mailing the guy from Tom's Techniques, he has a Hardinge.

Sent from my B15 using Tapatalk

 

[Hephaestus29]

Thanks for the suggestion, I've watched
some of his videos.