Search found 951 matches

by John Hasler
Fri Oct 26, 2018 7:35 am
Forum: General Discussion
Topic: What is a good rust preventative for machine storage.
Replies: 51
Views: 1645

Re: What is a good rust preventative for machine storage.

Stick one of these (or the magnetic version) https://www.etrailer.com/Vehicle-Heater ... 24100.html on the underside of each machine. It will get the heat into the metal where you need it.
by John Hasler
Thu Oct 25, 2018 6:54 am
Forum: Milling Machines
Topic: Joining the Pratt & Whitney 3C family
Replies: 29
Views: 1050

Re: Joining the Pratt & Whitney 3C family

How are you measuring that collet?
by John Hasler
Tue Oct 23, 2018 12:55 pm
Forum: Milling Machines
Topic: Joining the Pratt & Whitney 3C family
Replies: 29
Views: 1050

Re: Joining the Pratt & Whitney 3C family

The back end of an R8 is .9495" . The back end of a 4PN is 1.000" . This diameter is critical to locating the collet parallel to the spindle axis. I don't think the angles match, either.
by John Hasler
Mon Oct 22, 2018 2:02 pm
Forum: General Discussion
Topic: MEK sources
Replies: 30
Views: 1252

Re: MEK sources

SteveHGraham writes: I found sodium nitrate online at a better price. I am hoping it will eat stumps as well as the real thing. Not as well. Potassium nitrate provides potassium and nitrate, both of which are needed by the micro-organisms that actually eat the wood and both of which are in somewhat ...
by John Hasler
Mon Oct 22, 2018 7:05 am
Forum: Lathes
Topic: Threading without the end groove
Replies: 29
Views: 4264

Re: Threading without the end groove

Newer editions of Machinery's Handbook are actually less useful for manual machining than old ones. They started deleting some of what is considered obsolete data to make room for more CNC-related stuff so that the book wouldn't get to be a foot thick. I wish they'd put out an electronic-only editio...
by John Hasler
Sun Oct 21, 2018 1:17 pm
Forum: General Discussion
Topic: MEK sources
Replies: 30
Views: 1252

Re: MEK sources

MEK can be used to make MEK peroxide, which is an explosive. Is the MEKP used as a catalyst for polyester resin the same? If so there are no bans on it that I know of and I can buy a gallon over the counter for $51Can. If it is the same and freely available then restricting/banning the materials to...
by John Hasler
Sun Oct 21, 2018 7:35 am
Forum: General Discussion
Topic: MEK sources
Replies: 30
Views: 1252

Re: MEK sources

Acetone is also on that list. So is half your chemistry book.
by John Hasler
Fri Oct 19, 2018 6:55 pm
Forum: The Junk Drawer
Topic: Tesla cars
Replies: 56
Views: 4943

Re: Tesla cars

The "superchargers" are DC: they bypass the built-in charger. Others are, as I understand it, glorified extension cords. You can trickle charge from an ordinary wall outlet if you have the right cable. The car knows what kind of cable ("charger") is hooked to it and adjusts its demands accordingly. ...
by John Hasler
Fri Oct 19, 2018 7:43 am
Forum: The Junk Drawer
Topic: Tesla cars
Replies: 56
Views: 4943

Re: Tesla cars

liveaboard writes: > Yes, you could take long trips with an electric car, but you'd have to stop every 4 hours or so to recharge; > and it takes considerable time to recharge. 30 minutes at a public service station with high current DC chargers from dead to full charge. 4 hours is plugged into a sin...
by John Hasler
Thu Oct 18, 2018 6:37 pm
Forum: The Junk Drawer
Topic: Tesla cars
Replies: 56
Views: 4943

Re: Tesla cars

liveaboard writes:
> And what about the other 5%?

You stop for lunch and a recharge.
by John Hasler
Thu Oct 18, 2018 9:55 am
Forum: The Junk Drawer
Topic: Tesla cars
Replies: 56
Views: 4943

Re: Tesla cars

Most people live in large cities. I suspect that Tesla can concede the rural Nevada market and still do very well.

I live in rural northern Wisconsin. There are 20 public charging stations within 50 miles of me according to the DoE.
by John Hasler
Thu Oct 18, 2018 9:39 am
Forum: The Junk Drawer
Topic: Rant about Home Depot
Replies: 67
Views: 3654

Re: Rant about Home Depot

I didn't intend to start a debate about the cost of health care. I just used it as an example of something that has changed so much since the thirties that it makes no sense to use it as a component of an estimate of inflation since then. The services you purchased did not exist in 1933.