Search found 17115 matches

by Harold_V
Tue May 07, 2019 2:47 pm
Forum: Live Steam Marketplace
Topic: Wanted 5C Collets
Replies: 21
Views: 1766

Re: Wanted 5C Collets

According to Hass a 5C collet is good to 1/64" smaller than the standard size. While you can use single taper collets that way, it's not a good idea. As the collet goes below nominal, it grips only at the outer edge. Not only does that offer the opportunity for the collet to grip a part in a less t...
by Harold_V
Tue May 07, 2019 1:17 am
Forum: General Discussion
Topic: Bandsaw blade bevel
Replies: 22
Views: 804

Re: Bandsaw blade bevel

Because the blade sees the cut from both sides, it doesn't matter which side leads. You have that correct. Lap joints on belts for belt sanders are an example of which side leads being critical. You don't want the leading edge of the joint to see the material first, as it has the potential to hook, ...
by Harold_V
Mon May 06, 2019 3:09 pm
Forum: General Discussion
Topic: Book about precision
Replies: 21
Views: 1670

Re: Book about precision

I dunno, but I still recall looking through chemical catalogs as a boy and being fascinated. That interest manifested itself in eventually refining precious metals, which was the reason I was able to retire at a young age (54). Refining precious metals is all pretty much done chemically, if you don'...
by Harold_V
Sun May 05, 2019 4:03 pm
Forum: General Discussion
Topic: Milling procedure confirmation
Replies: 18
Views: 779

Re: Milling procedure confirmation

Determine chip load by multiplying the number of cutting teeth by the spindle speed. Multiply the sum by the desired chip load, and that will give you the feed rate in inches/minute. It's a good idea to not use less than a thou (prevent unnecessary rubbing) feed rate, and to not feed such that you o...
by Harold_V
Sun May 05, 2019 1:50 am
Forum: General Discussion
Topic: Milling procedure confirmation
Replies: 18
Views: 779

Re: Milling procedure confirmation

With multiple insert cutters, if you can keep one tooth always in contact, the interrupted cut won't be much of an issue. Also, because you're entering the cut with lead (due to the angle), it should also ease entry of each tooth. If you choose to rough with the face mill, just make sure you're not ...
by Harold_V
Sat May 04, 2019 5:02 am
Forum: General Discussion
Topic: UP Bigboy 4014 first steam and whistle
Replies: 5
Views: 353

Re: UP Bigboy 4014 first steam and whistle

A few minutes of the Big Boy's first trip away from the yard.

https://www.youtube.com/watch?v=2I0iUMDCkzc

Enjoy!

H
by Harold_V
Sat May 04, 2019 1:43 am
Forum: General Discussion
Topic: Milling procedure confirmation
Replies: 18
Views: 779

Re: Milling procedure confirmation

That's not a fly cutter---it's either a face mill, or an insert shell mill (old terminology, when shell mills didn't come with integral shanks). In either case (what ever you choose to call it) it's a good choice for the task at hand, where a fly cutter would not be. Fly cutters work great for stock...
by Harold_V
Fri May 03, 2019 3:32 pm
Forum: General Discussion
Topic: Machine tapping PVC sheet with small blind holes
Replies: 18
Views: 2015

Re: Machine tapping PVC sheet with small blind holes

In the interest of fairness, it was Russ Hanscom who first mentioned the use of spiral flute taps. I just agreed, having an understanding of why.

H
by Harold_V
Thu May 02, 2019 3:47 pm
Forum: General Discussion
Topic: Soluble Coolant Oil
Replies: 22
Views: 963

Re: Soluble Coolant Oil

I think the 4041 would benefit In the interest of ensuring proper information, is it safe to assume that the alloy of which you speak is chrome-moly? If so, it is designated as 4140. The sequence is important, as it designates the family to which all alloys are related, along with the carbon conten...
by Harold_V
Wed May 01, 2019 4:05 pm
Forum: Lathes
Topic: Soft Start for Lathe?
Replies: 54
Views: 2401

Re: Soft Start for Lathe?

It's all related to Ohm's law. The higher the voltage, the better the chance that the lethal amount of amperage will be delivered.

The point is, it takes very little amperage to kill.

H
by Harold_V
Wed May 01, 2019 3:54 pm
Forum: Live Steam
Topic: Railroad Supply History
Replies: 55
Views: 16657

Re: Railroad Supply History

Thanks. I have heard Chet's name mentioned time and again, and, if I recall correctly, he owned a UP Northern, which I saw in '90 at the IBLS meet in LA. Nice to put a face on the name.

H
by Harold_V
Wed May 01, 2019 3:50 pm
Forum: Lathes
Topic: Soft Start for Lathe?
Replies: 54
Views: 2401

Re: Soft Start for Lathe?

Some say it only takes 1 amp across the heart (hand to hand or hand to foot) to end you. I was told (high school electricity class) that the amperage is less-----much less. Mr. Madsen said 7 mils across the heart was enough to kill. Likely true, as the voltages and amperage in one's body are slight...