Search found 42 matches

by mihit
Fri Oct 11, 2019 12:47 am
Forum: Lathes
Topic: Screwcutting not picking up in the same place
Replies: 19
Views: 2967

Re: Screwcutting not picking up in the same place

Certainly an odd one. My first instinct is to cry "China" and leave it at that. What is the gear combo that gets you to 1.75? That would be something like 40:32:120:40 on my similar sized machine. Means aught to me but someone may be able to spot an issue from that. How much slop is there in your Th...
by mihit
Mon Oct 07, 2019 12:54 am
Forum: Casting & Foundry Work
Topic: 3D Printed Patterns and Sand Casting
Replies: 12
Views: 3380

Re: 3D Printed Patterns and Sand Casting

So this is done for cope/drag greensand casting?
I have wondered about 3D printing for "lost wax/foam" type casts. Haven't had much to do with it.
Nice work though, piece looks good.
by mihit
Sun Aug 25, 2019 3:04 am
Forum: General Discussion
Topic: Looking to build a dividing head
Replies: 6
Views: 1464

Re: Looking to build a dividing head

I do believe one of Dave Gingery's "Build a workshop from scrap" series included a book on dividing heads. He laid out and drilled the plates by hand on a drill press.
by mihit
Tue Jul 30, 2019 1:38 am
Forum: Casting & Foundry Work
Topic: Working with small wood pieces/patternmaking
Replies: 8
Views: 1794

Re: Working with small wood pieces/patternmaking

I have banned wood on all my metal machines :D Filthy 'orrible dusty stuff. Valve core print? So you need a negative (mould) to make a core? If you mean valve as in automotive cylinder type, I'd make a reamer, probably out of an old valve. Hog out the block with drills, then ream to size and shape. ...
by mihit
Mon Jul 22, 2019 7:30 pm
Forum: Lathes
Topic: Newbie - Buying first metal lathe
Replies: 89
Views: 18257

Re: Newbie - Buying first metal lathe

As to the insert tooling, they like to be run hard and faster than you may be comfortable with, starting out. Some shapes can be fussy with lead/clearance angles.
Very generally i'd say it's easier to get a good finish with HSS.
by mihit
Mon Jul 22, 2019 7:25 pm
Forum: Lathes
Topic: Newbie - Buying first metal lathe
Replies: 89
Views: 18257

Re: Newbie - Buying first metal lathe

I'd warrant that most people are glad to offer help, and if you do ask something that's been well covered, or too basic, you'll get told to RTFM! Lathes have been around for hundreds of years, going back to treadle lathes driven by a rope wrapped around the spindle and to a sprung tree branch. Tis a...
by mihit
Thu Jul 18, 2019 3:39 am
Forum: Casting & Foundry Work
Topic: casting in the third world
Replies: 16
Views: 4184

Re: casting in the third world

DavidF wrote:
Wed Jul 17, 2019 11:07 pm
What personal safety equipment would have been readily available to a foundry man in 1906 ??
All the stuff between his ears.
by mihit
Thu Jul 18, 2019 3:37 am
Forum: Casting & Foundry Work
Topic: casting in the third world
Replies: 16
Views: 4184

Re: casting in the third world

I do a bit of casting. Usually in shorts, crocs, no gloves (Cast Iron I use gloves cos it's really freakin hot and my tongs are too short) The body has it's own very good pre-warning systems. IE you know when you're too close to something hot because it gets uncomfortable, so you move away. If you d...
by mihit
Tue Jul 16, 2019 10:02 pm
Forum: Lathes
Topic: Enlarging Taper in Tailstock Quill--Pros? Cons?
Replies: 15
Views: 3482

Re: Enlarging Taper in Tailstock Quill--Pros? Cons?

"Don't make what you can buy" - Exactly the opposite of how I do things. Depends how you value your time I guess. I'd rather be making the things I need, than making the tools to make the jigs to make the machines to make the things I need. I've done enough machining (trade engineer) that it isn't ...
by mihit
Sun Jul 14, 2019 2:22 pm
Forum: Lathes
Topic: Enlarging Taper in Tailstock Quill--Pros? Cons?
Replies: 15
Views: 3482

Re: Enlarging Taper in Tailstock Quill--Pros? Cons?

"Don't make what you can buy" - as earlgo said, if you can source the part that's your first solution.

If you can't then making a whole new quill would be my choice.

If you do decide to modify it, I would look for/make a piloted reamer to avoid the potential yaw issue Harry mentions.
by mihit
Thu Jul 04, 2019 7:21 pm
Forum: Gunsmithing
Topic: gunsmithing tools
Replies: 10
Views: 3876

Re: gunsmithing tools

Where are you and whaddaya got?