Search found 1024 matches

by John Hasler
Fri Dec 14, 2018 5:02 pm
Forum: Milling Machines
Topic: Diagnosing a Milling Machine problem
Replies: 26
Views: 1703

Re: Diagnosing a Milling Machine problem

Looks like at least one flute is not cutting at all while at least one is worn all the way back to the secondary relief.
by John Hasler
Fri Dec 14, 2018 2:00 pm
Forum: The Junk Drawer
Topic: Engineers really know their stuff
Replies: 98
Views: 12809

Re: Engineers really know their stuff

As for modern motor vehicles, they are, as BadDog noted, designed to be easy to assemble, not easy to repair. Getting one fixed is not the manufacturer's concern—if they had their way, you'd junk your car and replace it when anything significant needed repair. Cars come with warranties, and recalls...
by John Hasler
Fri Dec 14, 2018 9:57 am
Forum: The Junk Drawer
Topic: Brass
Replies: 28
Views: 1789

Re: Brass

I just looked up Unipipe: interesting stuff. According to https://www.unipipe.ie/wp-content/uploa ... celist.pdf they have a toolless pushon connector system for it.

Looks like Unipipe is the same stuff as the "pex-al-pex" that is sold here.
by John Hasler
Thu Dec 13, 2018 8:42 am
Forum: The Junk Drawer
Topic: Brass
Replies: 28
Views: 1789

Re: Brass

Pretty simple, really. At that time, there was no micro-grain carbide, so what one considers sharp really wasn't. As brass has extremely good bearing qualities, carbide tools had the potential to float instead of cut, so achieving size would be a struggle. If the carbide in question had seen use fo...
by John Hasler
Tue Dec 11, 2018 10:21 pm
Forum: Home Shop CNC
Topic: How easy to add USB to a 1993 hass lathe?
Replies: 8
Views: 542

Re: How easy to add USB to a 1993 hass lathe?

A DB25 connector is not necessarily a parallel port. DB25 is the correct connector for RS232. The DE9 serial port connectors found on pcs are non-standard (though nearly universal). RS422 also uses DB25 connectors. (I'm abusing the standards and ignoring some details)
by John Hasler
Mon Dec 10, 2018 2:43 pm
Forum: Home Shop CNC
Topic: How easy to add USB to a 1993 hass lathe?
Replies: 8
Views: 542

Re: How easy to add USB to a 1993 hass lathe?

If it has a serial port (RS232) you want a USB to serial adapter like this: http://www.usconverters.com/usb-serial-rs232-adapters?zenid=86bd129f044cfb6e7c055243cd79fdac There are many other sources. Try to get one with an FTDI chip. The machine may have RS422: these people have USB converters for th...
by John Hasler
Sun Dec 09, 2018 9:07 pm
Forum: Milling Machines
Topic: Diagnosing a Milling Machine problem
Replies: 26
Views: 1703

Re: Diagnosing a Milling Machine problem

I also notice that this cutter in this particular collet seems to be out of round. In other words, when I spin the tool in the collet (not in the machine) I feel alternating tightness and looseness between the two. That sounds pretty wrong. Check for that effect with that collet and a different cut...
by John Hasler
Sat Dec 08, 2018 10:55 pm
Forum: General Discussion
Topic: The Long Taper
Replies: 8
Views: 742

Re: The Long Taper

They needed to make the drawtube captive on the back end of the spindle so the unscrewing it would drive the chuck off the taper.
by John Hasler
Sat Dec 08, 2018 8:05 pm
Forum: General Discussion
Topic: Cleaning Solvent.
Replies: 9
Views: 635

Re: Cleaning Solvent.

Henkel says that primer does more than just speed curing and that it is required on some materials including stainless steel. https://www.google.com/url?q=http://www.loctite.com.au/aue/content_data/354580_7128_Do_It_Right_Guide_v5_Approved.pdf&sa=U&ved=0ahUKEwiAj6avxJHfAhWG24MKHUHNCJkQFggUMAA&usg=AO...
by John Hasler
Sat Dec 08, 2018 5:25 pm
Forum: General Discussion
Topic: Cleaning Solvent.
Replies: 9
Views: 635

Re: Cleaning Solvent.

Tom1948 wrote:
Sat Dec 08, 2018 5:04 pm
Loctite makes a primer. Kind of pricey also but speeds up curing time especially in cooler weather.
You should still clean first.
by John Hasler
Sat Dec 08, 2018 4:46 pm
Forum: General Discussion
Topic: Cleaning Solvent.
Replies: 9
Views: 635

Re: Cleaning Solvent.

I use either starting fluid or acetone.
by John Hasler
Sat Dec 08, 2018 12:26 pm
Forum: General Discussion
Topic: The Long Taper
Replies: 8
Views: 742

Re: The Long Taper

tornitore45 wrote:
Sat Dec 08, 2018 11:10 am
It is my experiences that long taper will not keep under radial forces without a drawbar. Any machine that must pass stock trough a chuck can't really use a taper drive.
It could with a tubular drawbar. I know of no machine that uses one, though.