Search found 159 matches

by johnfreese
Fri Aug 02, 2019 6:43 pm
Forum: General Discussion
Topic: How to Make a Patient Lift Roll up to Low Machines?
Replies: 34
Views: 2503

Re: How to Make a Patient Lift Roll up to Low Machines?

I lift my machines with a pinch bar and blocks until I can get my toe-lift jack under it.
by johnfreese
Tue Jul 30, 2019 5:38 pm
Forum: General Discussion
Topic: How to Make a Patient Lift Roll up to Low Machines?
Replies: 34
Views: 2503

Re: How to Make a Patient Lift Roll up to Low Machines?

Put the machine on blocks tall enough the legs of the hoist will clear.
by johnfreese
Sat Jul 27, 2019 5:10 pm
Forum: Welding
Topic: welding a shaft
Replies: 4
Views: 493

Re: welding a shaft

Make the extension considerably oversized and the need for accurate alignment goes away. Definitely use a V groove.
by johnfreese
Thu Jul 25, 2019 6:21 pm
Forum: Lathes
Topic: Threading without the end groove
Replies: 44
Views: 13864

Re: Threading without the end groove

There are a number of designs for retracting tool holders you can find on the web. I have been wanting to scale up George H Thomas' design to use on a larger lathe. I believe it was in the 60s Snap Tap made a retracting threading holder that used a trip rod to release the tool. One end of the rod wa...
by johnfreese
Fri Jun 28, 2019 12:45 pm
Forum: General Discussion
Topic: Reaming Cast Steel Fittings without a Mill
Replies: 27
Views: 3196

Re: Reaming Cast Steel Fittings without a Mill

The hoe cutters should do well provided you can pilot them on the existing bore. As NP317 sail rigid support is essential.
by johnfreese
Sat Jun 22, 2019 3:57 pm
Forum: Lathes
Topic: Just Getting Started
Replies: 15
Views: 1343

Re: Just Getting Started

South Bend had a series of booklets with lathe projects and application of the lathe in various industries A lot of those are available on line. Of course How to Run a Lathe is the essential resource. American practice at the time was to use a lantern toolpost. The toolholders for the lantern toolpo...
by johnfreese
Fri Jun 21, 2019 2:29 pm
Forum: General Discussion
Topic: What is this for?
Replies: 4
Views: 1521

Re: What is this for?

The bracket on the overarm probably held the pipe for coolant or cutting oil.
by johnfreese
Tue Jun 18, 2019 2:04 pm
Forum: General Discussion
Topic: Turning plastic on a metal lathe
Replies: 18
Views: 2388

Re: Turning plastic on a metal lathe

My biggest problem turning plastics is chip control. The softer plastics machine best with high positive rake. That pretty much guarantees one continuous chip for the entire cut. I had one job boring PVC pipe fittings. I set it up on the lathe with a high positive rake boring bar. I had the shop vac...
by johnfreese
Tue May 28, 2019 7:24 pm
Forum: Milling Machines
Topic: Glass Bead Blasting Old Mill Vice
Replies: 18
Views: 4362

Re: Glass Bead Blasting Old Mill Vice

I have done it. It works well. Not great on thick greasy crud. Scrape it off first.
by johnfreese
Tue May 28, 2019 7:22 pm
Forum: General Discussion
Topic: Drilling UHMW
Replies: 6
Views: 2850

Re: Drilling UHMW

Sometimes I just press the work against the chuck jaws. The UHMW is probably too slick for that to work. Some people face off a blank, then cut some circular grooves in the face and then attach the work to the blank with super glue. The grooves provide space for excess glue. After machining the work...
by johnfreese
Tue May 28, 2019 11:56 am
Forum: General Discussion
Topic: Drilling UHMW
Replies: 6
Views: 2850

Re: Drilling UHMW

Band saw the blanks and finish in the lathe. Pressure turning is the easiest. Put a 4" steel bar in the lathe. Face it off. Glue a piece of coarse sandpaper to it, press the blank against the sandpaper using the tailstock. Take light cuts to finish the OD.
by johnfreese
Wed May 15, 2019 5:05 pm
Forum: General Discussion
Topic: Does anyone recognize this drill sharpening jig
Replies: 6
Views: 1709

Re: Does anyone recognize this drill sharpening jig

Maybe this will help figure out what parts you need to make.
http://www.hemingwaykits.com/acatalog/i ... 311%2ehtml