Search found 75 matches

by Grantham
Thu Feb 16, 2017 11:35 pm
Forum: Lathes
Topic: Attachment for turning a large radius convex surface
Replies: 25
Views: 4640

Re: Attachment for turning a large radius convex surface

Wes, glad to inspire. My belt sander has continued to be improved. A platen
allows grinding flat surfaces and a knife grinding attachment is used to hollow
grind the blade. As you folks know, a shop to work metal is invaluable. Rod
by Grantham
Thu Feb 16, 2017 3:54 pm
Forum: Lathes
Topic: Attachment for turning a large radius convex surface
Replies: 25
Views: 4640

Re: Attachment for turning a large radius convex surface

I stand corrected. Your kind words about my crown attachment are appreciated. Rod
by Grantham
Wed Feb 15, 2017 10:02 pm
Forum: Lathes
Topic: Attachment for turning a large radius convex surface
Replies: 25
Views: 4640

Re: Attachment for turning a large radius convex surface

It seems you folks like to over complicate things<g>. My
video showing an attachment made for crowning a pulley
for a belt sander on YouTube might be helpful for some of
you fine fellows.
https://www.youtube.com/watch?v=vXLXDj-L8aw&t=2s
Rod Grantham
by Grantham
Wed Dec 28, 2016 5:46 pm
Forum: General Discussion
Topic: shop built dividing head help
Replies: 36
Views: 4909

Re: shop built dividing head help

https://www.youtube.com/watch?v=-we6ORrJgUI&t=5s shows
part 1 of my 2 part video on building a cheap diving head. Hope
this give you inspiration. Also on my channel is a video showing
the machining of a spur gear. Rod
by Grantham
Fri Sep 23, 2016 4:23 pm
Forum: General Discussion
Topic: Crowning a 2"-wide Pulley Without CNC?
Replies: 17
Views: 2272

Re: Crowning a 2"-wide Pulley Without CNC?

Several years ago I needed crowned pulleys for a belt sander build. You may find
my YouTube video interesting, https://www.youtube.com/watch?v=vXLXDj-L8aw .

by Grantham
Sat Jul 02, 2016 12:30 am
Forum: Home Shop CNC
Topic: Source for Reasonably Priced Ballscrew?
Replies: 15
Views: 6174

Re: Source for Reasonably Priced Ballscrew?

To wind up with about 20" of travel, you will need a 600mm machined end ballscrew. The machined ends and ballnut take up about 4", leaving you with about 19.5" of travel. Both ends are machined to 10mm. One end of the ballscrew is threaded. BK12 and BF12 end supports support the ballscrew and a ball...
by Grantham
Tue May 03, 2016 4:31 pm
Forum: The Junk Drawer
Topic: need cutting oil suggestions
Replies: 5
Views: 1797

Re: need cutting oil suggestions

Harold, you make a good point. I get the same reaction with a tingle on my tongue with prolonged exposure to photopolymer resin, a material I've worked with for over 30 years. I usually wear nitrile gloves with that resin. Wearing slippery oil covered gloves around the lathe and mill, scare me. This...
by Grantham
Tue May 03, 2016 10:52 am
Forum: The Junk Drawer
Topic: need cutting oil suggestions
Replies: 5
Views: 1797

need cutting oil suggestions

For the past 15 years or so I've been using Cool Tool cutting and tapping fluid. Lately I've
noticed a sensation on the end of my tongue after a couple hours of exposure to this
stuff. Have any of you folks had similar issues and what cutting oil did you change to?
Thanks for any help. Rod
by Grantham
Wed Jun 25, 2014 5:47 pm
Forum: General Discussion
Topic: Metal Spinning
Replies: 11
Views: 1257

Re: Metal Spinning

My YouTube video should give you some ideas. Copper work hardens while being worked and will need to be annealed a couple times during the spinning operation. Metal spinning is near instant gratification because once the mandrel is made, making each part only takes a few minutes. https://www.youtube...
by Grantham
Wed Jun 25, 2014 2:21 pm
Forum: Welding
Topic: Work holder
Replies: 3
Views: 1453

Work holder

A guy never seems to have enough arms, hands & fingers to hold and position items for welding and other operations in the shop. While this is not my original idea, my approach is a cheap and simple solution. The holders are ½” pipe nipples and fittings attached to a brake disc. This gives me elevati...
by Grantham
Tue Jun 03, 2014 5:16 pm
Forum: General Discussion
Topic: Can Fix-It Shops Turn a Profit in 2014?
Replies: 28
Views: 2483

Re: Can Fix-It Shops Turn a Profit in 2014?

Basically it's a good idea. If your personality can tolerate deadlines and people trying to chisel your price down, go for it.This is the kind of stuff I get talked into doing for my family and neighbors. I insist they forget where they got it made/fixed/modified, so every Tom, Dick and Harry doesn'...
by Grantham
Thu May 29, 2014 10:33 pm
Forum: Milling Machines
Topic: identifying the right gear hob cutter
Replies: 12
Views: 2073

Re: identifying the right gear hob cutter

What you are likely asking for is an involute cutter. Normally 12 teeth is about the minimum limit of teeth because the involute tooth form tends to undercut with less teeth. A set of 8 involute cutters is needed to cut gears from 135 teeth to 12. A number 8 involute cutter cuts 12 - 13 teeth, numbe...