Search found 45 matches

by bjmh46
Sat Jul 08, 2017 4:43 am
Forum: Milling Machines
Topic: Chandler Duplex boring heads
Replies: 13
Views: 6573

Re: Chandler Duplex boring heads

Can be used as stated in spro's post, but main function in addition to boring, is facing (think bearing seat shoulder), undercutting, snap ring and o-ring grooves. A beautiful piece of tooling that also has the ability to set tenths. In fact the head is capable of better accuracy than I can measure....
by bjmh46
Sat Oct 15, 2016 5:05 am
Forum: General Discussion
Topic: Using Marv Klotz's utilities with Windows 7
Replies: 5
Views: 1257

Re: Using Marv Klotz's utilities with Windows 7

I'd like to take this opportunity to thank Marv for these utilities that I've used for many years now--starting with windows 95! I left windows after win 7, but I still use the utilities on Linux via a program called Dos emulator. Shows you how timeless a piece of software can actually be! Cone, cam...
by bjmh46
Sun Feb 21, 2016 6:38 am
Forum: General Discussion
Topic: Help needed for a part
Replies: 23
Views: 2500

Re: Help needed for a part

The drawing is understandable, though the end view should be on the upper left or change the bore to dashed lines and bold the 3mm thick "tongue" lines. As Steve says, need a tolerance. That long tongue could be a problem in terms of straightness and perpendicularity. A machinist can't read your mi...
by bjmh46
Mon Aug 17, 2015 5:36 am
Forum: General Discussion
Topic: How do you tighten a hole ??
Replies: 16
Views: 2568

Re: How do you tighten a hole ??

For some bores that have been machined a few thou oversize, you can shrink it with heat. Slowly, and evenly heat up the area around the bore, to where it turns blue, they walk away, and let it cool down slowly. I've reduced 4" and larger bore diameters by as much as .006". Important that you heat e...
by bjmh46
Fri Mar 20, 2015 9:28 am
Forum: Milling Machines
Topic: Newbie Introduction and "A Tale of Two M Heads"
Replies: 12
Views: 2115

Re: Newbie Introduction and "A Tale of Two M Heads"

The N-06 bearing locknut can be more easily removed if you first remove the pulley bearing housing/oil distribution casting from the aluminum pulley housing. I made a wrench for mine with about 20 minutes of lathe and bandsaw time.
Bob
by bjmh46
Fri Mar 20, 2015 8:19 am
Forum: Milling Machines
Topic: Newbie Introduction and "A Tale of Two M Heads"
Replies: 12
Views: 2115

Re: Newbie Introduction and "A Tale of Two M Heads"

Greg, Nice job on the restoration so far. I would advise you to just swap out the heads. Head castings were honed to within a couple of tenths fit with the hard chromed quill, i.e. custom fit. There's always the chance that you have two heads with exactly the same bore/quill diameters, but I wouldn'...
by bjmh46
Thu Dec 18, 2014 9:44 am
Forum: General Discussion
Topic: HO HO HO A Gear Cutting We Will Go !!!!
Replies: 14
Views: 1742

Re: HO HO HO A Gear Cutting We Will Go !!!!

There's a program (GEARPA) on my webpage which uses a method from "Machinery's Handbook" to measure pressure angle using home shop equipment. I wrote it as an experiment to see if such measurements could be done without exotic equipment. A professional machinist friend gave it a try and pronounced ...
by bjmh46
Fri Aug 15, 2014 7:49 am
Forum: General Discussion
Topic: How many diff. wheels for your tool and cutter grinder/
Replies: 3
Views: 819

Re: How many diff. wheels for your tool and cutter grinder/

I made 10, and could use more. Also made a 2" extension which I've found extremely useful.

Bob
by bjmh46
Tue Jul 08, 2014 5:49 am
Forum: General Discussion
Topic: Drilling/Tapping Acetal or UHNW plastics
Replies: 11
Views: 4151

Re: Drilling/Tapping Acetal or UHNW plastics

Mr. Ron, The only way I've ever been successful making a single anti-backlash nut is with an undersize tap. And successful was debatable. As Harold pointed out, H limits define how far oversize a tap is ground at the pitch diameter. The most common tap in the size you are talking would be an H-3 and...
by bjmh46
Mon Jan 20, 2014 7:00 am
Forum: General Discussion
Topic: Bandsaw blade alignment question
Replies: 3
Views: 974

Re: Bandsaw blade alignment question

Dave, I've built several horizontal band saws and learned very quickly that the twist needs to center on the back inside corner of the blade if the saw has tapered, flanged wheels. I thought like you that intuitively it should twist about its center line, and built one saw that way. I could never ge...
by bjmh46
Thu Oct 24, 2013 6:14 am
Forum: General Discussion
Topic: Useful Letter Stamp Sizes?
Replies: 18
Views: 2060

Re: Useful Letter Stamp Sizes?

Image


I've got several sets but I love the 1/16 Fowler set that I bought bakck sometime in the '70's. The above shot is the Y-axis dial on my ho-made cutter grinder as an example.

Regards
Bob
by bjmh46
Tue Apr 23, 2013 6:24 am
Forum: Milling Machines
Topic: Removing M-head spindle
Replies: 4
Views: 1099

Re: Removing M-head spindle

Can't you hold the splined top of the spindle, either with one of its mating splines or in your woodworkers vise? Tried it in the woodworker's vice - just tore up the wood. The mating spline is in the drive pulley and I don't want to mess that up. I just made a block of aluminum with a hole bored t...