Search found 455 matches

by TomB
Tue Apr 08, 2008 9:29 pm
Forum: General Discussion
Topic: Milling Brass and Bronze
Replies: 25
Views: 6771

I'm 65 and have used reading glasses and safety glasses for 10 or more years, but no glasses for distance. Over the last year I found that I needed more light for machining and even put one of the 6" diameter magnifiers with the round floresent light on my machine. Three weeks ago at a normal physic...
by TomB
Fri Apr 04, 2008 11:34 pm
Forum: General Discussion
Topic: Rotary table added to the workshop
Replies: 50
Views: 6907

Grizzly RT and chuck backer Plate

My Grizzly RT does not include a chuck backplate. I have put my 4 jaw on the RT by first locating the RT center directly under the mill spindle. (I use edge finders and my DRO and work off the MT hole in the RT.) Then I take out the edge finder and insert a big lathe center in the mill. I locate the...
by TomB
Fri Apr 04, 2008 11:03 am
Forum: General Discussion
Topic: Rotary table added to the workshop
Replies: 50
Views: 6907

Clamping RT to table.

I have used rotary tables ever since I began machining. (I’ve not converted to CNC mostly because I’ve not had the time.) I actually use 2 Grizzly tables, 1) YUASA type 8” and 2) a cheap 3”. I find the 8” is heavy and it does add stability when milling. It works really well for rounding corners, dri...
by TomB
Fri Mar 28, 2008 10:37 pm
Forum: General Discussion
Topic: Broaching Square Holes
Replies: 18
Views: 9346

After I saw the post on rotary broaching I looked into it to see if I could hack something together to accomplisth the process. On the surface it did not seem too impossible. They make a hardened tool bit with the same shape as the object hole. Then they mount it in the tailstock at a slight angle t...
by TomB
Fri Mar 28, 2008 6:27 pm
Forum: General Discussion
Topic: Making a rack and pinion pair?
Replies: 11
Views: 6412

Both the rack and the pinion can be made with a hob but cutting them on home lathe or mill typically requires some tooling to hold and move things, more than just a vise or indexing head. However it is almost always easier and cheaper to buy them. Boston Gear has a good selection in stock plus a ver...
by TomB
Tue Mar 25, 2008 5:21 pm
Forum: General Discussion
Topic: Boring Bar Help, Please
Replies: 78
Views: 11041

A while ago I was trying to find a faster way to cut big holes in steel. Several people suggested I use a hole saw. It did not work for me in steel but you might find it worked in Al and was faster. Maybe cut a hole just smalled than required and then bring it out to tolerance with a few passes of t...
by TomB
Fri Feb 08, 2008 9:33 am
Forum: General Discussion
Topic: Broaching Square Holes
Replies: 18
Views: 9346

Thank you all

Thanks to all for the replies. I started the thread just before I left on a business trip and I’ve been able to follow replies but not actually respond from my business computer. As I indicated I want to learn how to use the broaching tools so I will go forward with the way I originally planned. I v...
by TomB
Sat Feb 02, 2008 10:08 am
Forum: General Discussion
Topic: Broaching Square Holes
Replies: 18
Views: 9346

Broaching Square Holes

I have a set of keyway broaches and a couple of shop presses and want to learn how to use them. My initial project is making some very specialized sockets (as in socket wrench set) for use in tightening a 1.75” diameter externally threaded sleeve. The sleeve needs to be driven via 4 notches (1/2” de...
by TomB
Mon Jan 28, 2008 8:23 pm
Forum: 3-in-1 Metalworking Machines
Topic: Shoptask owners?
Replies: 13
Views: 16415

I have a year old TriPower and am quited pleased with it. I've been looking to make some improvements, but I bought it to make real parts and I've been doing that. Typically my things are big, I buy 6" by 2" channel and 2" by 2" square tubing. I'm looking to add bored holes for pins and chains or to...
by TomB
Mon Jan 21, 2008 9:00 pm
Forum: Welding
Topic: Beginner Stick Welding Information
Replies: 3
Views: 3162

Beginner Stick Welding Information

25 years ago I took adult ed course on welding; I focused on torch. After that I bought the system and have used it often. Then last spring I decided to add arc welding to my skills. I bought a Miller TIG welder and got a thin book. I read the book and got started. I found it to be pretty easy and I...
by TomB
Mon Jan 14, 2008 9:58 pm
Forum: The Junk Drawer
Topic: Hydrogen is not a viable fuel for personal transportation
Replies: 55
Views: 11211

Re: Hydrogen as a fuel

The essay that started this thread is excellent, and the key points made: (1) the system cost of doing electrolysis is a net loss, (2) hydrogen fires are dangerous beyond what we understand are today exactly accurate. I believe the paper made some other points (tank pressures, transport, cryogenic c...