Search found 177 matches

by hobgobbln
Mon Jul 03, 2017 11:10 pm
Forum: Lathes
Topic: How close is close enough?
Replies: 42
Views: 3620

Re: How close is close enough?

I share a similar thought process with Nyle. I was making some parts for a company a friend of mine started based around just a simple "can you make me a ____ ?" That turned into me making >10,000 pieces at night and on weekends on my hobby machines. Almost every part I make was built arou...
by hobgobbln
Wed Feb 01, 2017 2:29 pm
Forum: Milling Machines
Topic: Beginner : Bar for boring head
Replies: 35
Views: 3432

Re: Beginner : Bar for boring head

I like the idea of the bar with two posts. The setscrews are to use different length posts to make the "boring bar" longer?
by hobgobbln
Wed Feb 01, 2017 6:07 am
Forum: Milling Machines
Topic: Beginner : Bar for boring head
Replies: 35
Views: 3432

Re: Beginner : Bar for boring head

Oh wow, those Mesa bars are pretty cheap. I'll give one of those a try. And A.R. Warner has some TCMW HSS inserts that might fit. Thanks!
by hobgobbln
Tue Jan 31, 2017 10:31 pm
Forum: Milling Machines
Topic: Beginner : Bar for boring head
Replies: 35
Views: 3432

Re: Beginner : Bar for boring head

I was only joking about throwing them out. I'm sure I'll use them for something.

Thanks everybody
by hobgobbln
Tue Jan 31, 2017 8:24 pm
Forum: Milling Machines
Topic: Beginner : Bar for boring head
Replies: 35
Views: 3432

Re: Beginner : Bar for boring head

The boring head takes 1/2" shanks and that's what came with it so an eccentric sleeve is out. I guess I'll either pick up or make a new bar and save these for the lathe. Or a trash can. Here's a side view of that same bar showing how far off the height is. Explains why they threw them in for fr...
by hobgobbln
Tue Jan 31, 2017 5:03 pm
Forum: Milling Machines
Topic: Beginner : Bar for boring head
Replies: 35
Views: 3432

Re: Beginner : Bar for boring head

The boring head kit I ordered came in today. I took a picture of a boring bar because all 9 in the set are just like this. If I remember the terminology correctly, in a lathe setup this would be considered pretty severe negative rake. Are the bars meant to be rotated like I have it in use or is it j...
by hobgobbln
Sat Jan 28, 2017 5:10 pm
Forum: Milling Machines
Topic: Beginner : Bar for boring head
Replies: 35
Views: 3432

Re: Beginner : Bar for boring head

I ordered a 2" head and R8 shank from Travers. They were having a sale on their house brand and it came with some brazed bars. We'll see how lucky I get.

Thanks for all the info everybody.
by hobgobbln
Fri Jan 27, 2017 10:56 am
Forum: Milling Machines
Topic: Beginner : Bar for boring head
Replies: 35
Views: 3432

Re: Beginner : Bar for boring head

I'm glad I asked then because it doesn't sound as cut and dry as it could be. Unfortunately I do not have the proper equipment to modify carbide so it I'll have to take my chances.

Any experience with indexable bars? With the correct size insert for it, are those safe to assume proper alignment?
by hobgobbln
Thu Jan 26, 2017 7:31 pm
Forum: Milling Machines
Topic: Beginner : Bar for boring head
Replies: 35
Views: 3432

Beginner : Bar for boring head

First, I've been away from the board and my own shop for about a year and its really great to come back and see a lot of the familiar names. Hope everyone has been well. I've been looking into picking up my first boring head for a project and I've got a newbie question about boring bars. If a tool i...
by hobgobbln
Wed Feb 03, 2016 5:35 pm
Forum: Home Shop CNC
Topic: My first part - and a dimple
Replies: 25
Views: 4879

Re: My first part - and a dimple

It seems like a bad combination of stickout and feeding to fast. Try thinking of it this way: You chuck up a piece of 1/8" round stock in the lathe that extends 1" past the jaws and spin it at 2500 rpm. You could try to take a 0.020 deep cut and feed it at 5 IPM, but it will most likely ju...
by hobgobbln
Wed Feb 03, 2016 8:09 am
Forum: Home Shop CNC
Topic: My first part - and a dimple
Replies: 25
Views: 4879

Re: My first part - and a dimple

Glenn's right. 6 IPM at 0.020 with an 1/8" endmill sounds pretty fast to me. If you look at the bottom of the valleys you can see chatter marks that curve like the tool was bending. What IPM did you plunge with? I'd put my money on tool deflection for the dimples if you've got the machine tight...
by hobgobbln
Tue Feb 02, 2016 1:27 pm
Forum: General Discussion
Topic: Cast Iron for height gauge base?
Replies: 1
Views: 433

Cast Iron for height gauge base?

I have a left over chunk of class 40 gray cast iron from a project. Would that be a suitable material to make a gauge base for use on a granite surface plate? I don't want to ruin the granite and I'm not sure how those two will wear together.

Griz

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