Search found 139 matches

by GadgetBuilder
Sun Aug 03, 2014 11:02 am
Forum: General Discussion
Topic: Grinding End Mills at Home
Replies: 15
Views: 4430

Re: Grinding End Mills at Home

Building a drill sharpener is FAR easier than building a cutter grinder - the only optional attachment you might want is a point splitter. Material cost is moderate, typically about $130, mainly for a CBN wheel, motor, and collets. See: http://www.gadgetbuilder.com/DrillSharp.html#Facet4 Drills cut ...
by GadgetBuilder
Fri Aug 01, 2014 8:20 am
Forum: General Discussion
Topic: Grinding End Mills at Home
Replies: 15
Views: 4430

Re: Grinding End Mills at Home

I built a Brooks grinder and made a simple attachment for sharpening flutes of end mills. The Brooks is a serious project, not to be undertaken lightly; it took me several months. The flute attachment was trivial and works adequately for the home shop. See: http://www.gadgetbuilder.com/Brooks_Grinde...
by GadgetBuilder
Thu Jun 05, 2014 10:07 pm
Forum: General Discussion
Topic: How to Counterbore #11 Hole to 5/16" in Aluminum?
Replies: 11
Views: 3188

Re: How to Counterbore #11 Hole to 5/16" in Aluminum?

Your post inspired me to document how I make counterbores from drill rod.
http://www.gadgetbuilder.com/CounterBore.html

Might be worth trying for your project since your work piece is aluminum.

John
by GadgetBuilder
Sat May 18, 2013 12:17 pm
Forum: General Discussion
Topic: should I make a form tool?
Replies: 6
Views: 1334

Re: should I make a form tool?

If you're going to be making more of these parts over time, I'd make a form tool to fit the tailstock. You're working aluminum so a tool made from drill rod and hardened should last quite a while and would be easy to resharpen. There was a clockmaking site that showed how to make piloted counterbore...
by GadgetBuilder
Sat Feb 23, 2013 9:40 pm
Forum: General Discussion
Topic: Size for Press-Fit Part in 0.6875" Hole?
Replies: 27
Views: 4171

Re: Size for Press-Fit Part in 0.6875" Hole?

It's difficult to take the last thou off with a lathe tool, especially if you're moving back and forth between press and lathe because re-mounting may induce a little eccentricity so the part becomes lobed. When fit to tenths is required I use lapping - it is more controllable plus it reduces any lo...
by GadgetBuilder
Sat Feb 23, 2013 3:35 pm
Forum: General Discussion
Topic: Fiddling with Rotary Broach Ideas
Replies: 23
Views: 3970

Re: Fiddling with Rotary Broach Ideas

Steve: I think you understand what Mike Cox did perfectly, the cutter does rotate on a fixed axis. In your prior thread I mentioned that I used the approach you outlined above. That is, the broach holder's axis is set at about 1 degree to the work axis (by rotating the QCTP) and the center of the br...
by GadgetBuilder
Tue Feb 19, 2013 11:57 am
Forum: General Discussion
Topic: How to Make Blind Six-Sided Hole for Allen Wrench?
Replies: 35
Views: 5649

Re: How to Make Blind Six-Sided Hole for Allen Wrench?

The broach end does need to be concave - here's one way to make the one you have concave: http://www.frets.com/HomeShopTech/Tooling/BroachMaking/broachmaking.html I drilled the end prior to hardening but the Dremel scheme lets you make it concave after hardening. The chips formed by the broach curl ...
by GadgetBuilder
Sun Feb 17, 2013 10:39 am
Forum: General Discussion
Topic: How to Make Blind Six-Sided Hole for Allen Wrench?
Replies: 35
Views: 5649

Re: How to Make Blind Six-Sided Hole for Allen Wrench?

A rotary broach is the usual way to make a 6 sided hole - but they're too expensive for the typical home shop. Mike Cox came up with an inexpensive, modest effort way to make a rotary broach in the home shop, see: http://mikesworkshop.weebly.com/rotary-broaching.html I made one as an experiment and ...
by GadgetBuilder
Thu Jan 24, 2013 4:46 pm
Forum: General Discussion
Topic: Confusing Chinese Protractor
Replies: 7
Views: 2421

Re: Confusing Chinese Protractor

I found this drawing helpful: http://img.photobucket.com/albums/v186/JoelinTX/ProtractorBW.jpg I printed the drawing and keep it in the box with the protractor. Still takes me a while to figure out how to use the protractor each time. The protractor is quite accurate considering the cost. It works a...
by GadgetBuilder
Mon Sep 03, 2012 9:31 am
Forum: General Discussion
Topic: Racks for metal file storage
Replies: 21
Views: 12863

Re: Racks for metal file storage

Below is a file storage rack I saw in a friend's shop. It is wood and mounts to the wall as suggested in your post. I haven't built one but it looks straight forward - strips of wood screwed together with spacers to form slots. It does require handles to prevent the files from falling through the sl...
by GadgetBuilder
Sun Jun 24, 2012 6:58 pm
Forum: General Discussion
Topic: Double drilling holes.
Replies: 21
Views: 3914

Re: Double drilling holes.

I've had good results double drilling by adding "Secondary Point Angles" (SPA's) to drills greater than 3/16. Picture: http://www.gadgetbuilder.com/6_Facet_SplitPointC.jpg Much less excitement as you start to enter the hole because the drill doesn't have a point at the outer end of the flute to catc...
by GadgetBuilder
Mon May 21, 2012 4:47 pm
Forum: General Discussion
Topic: DTI Clamp
Replies: 9
Views: 4222

Re: DTI Clamp

If you don't mind using steel for the clamp then consider copying the principle used by Starrett. I made the copy seen below with the part holding the tooth index longer than normal. It seems to hold two rods in a relation similar to the clamp you built. I use a similar clamp on the QCTP holder for ...