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by Harold_V
Sun Jun 20, 2021 3:30 pm
Forum: Sheet Metal Fabrication
Topic: Fitting and bonding corrugated metal roofing sheets
Replies: 11
Views: 178

Re: Fitting and bonding corrugated metal roofing sheets

In order to achieve success, you're going to have to limit the amount of heat introduced. If you use a torch, that's most likely not going to happen. Common practice in the old days was to use an iron. By controlling the temperature of the iron, you get melting at the point of contact, and freezing ...
by Harold_V
Sun Jun 20, 2021 3:22 pm
Forum: General Discussion
Topic: Bearing race nomenclature
Replies: 26
Views: 4148

Re: Bearing race nomenclature

stephenc suggested the use of a ball end mill and rotab. Modern carbide endmills are CNC ground and should faithfully generate the desired profile. The only real problem with ANY ball end mill is that the center is stationary when being used, and often produces a rather unusual profile, or, at the l...
by Harold_V
Sun Jun 20, 2021 1:41 am
Forum: General Discussion
Topic: Bearing race nomenclature
Replies: 26
Views: 4148

Re: Bearing race nomenclature

HSS is available in rounds. You'd be best served, assuming the radius is critical, to use one of them as you suggested. I'd pursue that avenue were the project mine. 17-4 is tough. It is NOT hard. That's not to say it is free machining. It is not. However, if you work with sharp tools and reasonable...
by Harold_V
Sun Jun 20, 2021 1:21 am
Forum: Milling Machines
Topic: Milling Vise Squareness
Replies: 30
Views: 546

Re: Milling Vise Squareness

Parallelism between the table and the vise sliding surface would be addressed with shims. If a vise is re-machined (ground or fly cut) as you suggested (that's precisely how it would be done if it was my project) there would be no need for shims. For that matter, I can't think of anywhere you'd put...
by Harold_V
Sat Jun 19, 2021 3:22 pm
Forum: Sheet Metal Fabrication
Topic: Fitting and bonding corrugated metal roofing sheets
Replies: 11
Views: 178

Re: Fitting and bonding corrugated metal roofing sheets

I tried to silver solder cast zinc and it just beaded up - and the zinc was melting. Zinc can not be silver soldered due to the melting point of the zinc as compared to silver solder. You most likely could achieve acceptable results by using silver bearing solder, however, assuming you use an accep...
by Harold_V
Sat Jun 19, 2021 3:47 am
Forum: Milling Machines
Topic: Milling Vise Squareness
Replies: 30
Views: 546

Re: Milling Vise Squareness

Now I understand your earlier post. what I was thinking is the fact the ways are not parallel to the y axis is one problem. I'm not sure that condition was of concern, but if it isn't parallel, then, yeah, it is of concern. A vise should replicate the degree of precision provided by the machine too...
by Harold_V
Fri Jun 18, 2021 3:42 pm
Forum: Milling Machines
Topic: Milling Vise Squareness
Replies: 30
Views: 546

Re: Milling Vise Squareness

I'm not quite sure I understand your comments in regards to the Y axis. If the vise is set up with the vise ways parallel to the table of the machine on which the base would be altered (to correct the existing problem), the vise and its ways, after machining, would be parallel to the table on which ...
by Harold_V
Fri Jun 18, 2021 3:20 pm
Forum: Live Steam
Topic: Steam turbine generator
Replies: 111
Views: 32822

Re: Steam turbine generator

When it comes to the stator, the correct choice of steel is important. Correct, but it SHOULDN'T be steel, and that's what spells the difference. Steel is an alloy. Iron is an element. What is required is iron, not steel. Steel contains carbon in solution. Cast iron contains carbon, both in solutio...
by Harold_V
Fri Jun 18, 2021 3:10 pm
Forum: Milling Machines
Topic: Milling Vise Squareness
Replies: 30
Views: 546

Re: Milling Vise Squareness

Ok, I have a clear image now. It can be described two ways, one being perpendicularity to the X-Y axes, the other as parallelism to the theoretical Z axis. It can manifest as an error in the true Z axis, with error front to back, side to side, or a combination of the two. The side to side error coul...
by Harold_V
Fri Jun 18, 2021 3:40 am
Forum: Live Steam
Topic: Steam turbine generator
Replies: 111
Views: 32822

Re: Steam turbine generator

I could never find a source of iron for the field coil, That shouldn't be too difficult. The cores from transformers would be an excellent source (assuming it's thin enough), especially considering that you'd be dealing with rather small pieces. All they are is what is commonly known as Armco iron,...
by Harold_V
Fri Jun 18, 2021 1:56 am
Forum: Milling Machines
Topic: Milling Vise Squareness
Replies: 30
Views: 546

Re: Milling Vise Squareness

Russell got it exactly right.The vise appears to be out in the Z axis, that is, parallelism to the table surface. Kelly, am I thick, or do you mean that it's a perpendicularity problem? The Z axis is normally the quill/spindle----and I gather that the vise jaw isn't parallel when the spindle is dia...
by Harold_V
Wed Jun 16, 2021 1:31 pm
Forum: Milling Machines
Topic: table wear + movement
Replies: 16
Views: 301

Re: table wear + movement

Harold, are you calling my milling machine a PIG??? Chuckle! Nope! But if you make the mistake of a partial rebuild, I may be so inclined. (I can now see why you may have thought I was attacking your machine. I was not. I was attacking the concept of addressing only one part of an issue, which does...