[PSUBS-MAILIST] Fw:

[Hugh Fulton via Personal_Submersibles]

Hank,

Old machining trick.  IF you are getting chatter when drilling and want a good surface finish on a taper such as a countersink or a flat bottom then get a piece of rag a couple of thicknesses and a bit bigger than the hole and just drill or countersink or whatever straight through the rag and it tends to fill the cavities and give a bit of back pressure to the tool.  Try it. Other than that grinding the tool so when you feed it in it is resting on the back of the flank and it self supports.  Too many people have too great a clearance on the back edge of a drill point or tool.  On a lathe you can also raise the tool center height a gnat and it will rest on the clearance.

Cheers Hugh

 

 

 

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of hank pronk via Personal_Submersibles
Sent: Tuesday, 22 March 2016 1:51 p.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] Fw:

 

Hugh,

I never heard about drilling through a rag?  tell me more.

Hank

 

On Sunday, March 20, 2016 4:56 PM, Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 

Hank you can get a counterbore if it is the right size.  They have a spigot for doing flat spots.  They are used for doing a bore for capscrew heads and are a common tool.

If you are using them with a hand drill there is a potential for them to chatter but if you drill through a rag it stops the chatter and gives you a good finish.

 

Hugh

 

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Stephen Fordyce via Personal_Submersibles
Sent: Monday, 21 March 2016 11:30 a.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] Fw:

 

Excellent, much easier to use an existing tool than make one - but I remain sceptical you can be bothered waiting for it to arrive :)

On 21 Mar 2016 8:55 am, "hank pronk via Personal_Submersibles" <personal_submersibles at psubs.org> wrote:

Thanks Steve,

Here is the tool I need, perfect!  now I can look for one.

Hank

 

On Sunday, March 20, 2016 3:50 PM, xxx xxxxx <mp13 at live.ca> wrote:

 

https://www.google.ca/imgres?imgurl=http://www.gandtrack.co.uk/images/back-spot-face-cutter-1.jpg <https://www.google.ca/imgres?imgurl=http%3A%2F%2Fwww.gandtrack.co.uk%2Fimages%2Fback-spot-face-cutter-1.jpg&imgrefurl=https%3A%2F%2Fwww.gandtrack.com%2Fproducts%2Fback-spot-face-cutters&docid=cHlyzH-_dmgKYM&tbnid=6Xe80KbEvs1MrM%3A&w=600&h=310&client=safari&ei=4RrvVpWwKMODmQGTxIX4BA> &imgrefurl=https://www.gandtrack.com/products/back-spot-face-cutters&docid=cHlyzH-_dmgKYM&tbnid=6Xe80KbEvs1MrM:&w=600&h=310&client=safari&ei=4RrvVpWwKMODmQGTxIX4BA 


 


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