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Member postings for TomK

Here is a list of all the postings TomK has made in our forums. Click on a thread name to jump to the thread.

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Thread: Snapped 4BA Tap
15/10/2010 20:53:11
Mick
           Don't know if you have used 3 side stellite drills but they are not for faint hearted.
I have some from my days in working in a toolroom where we used them to modifiy tooling that had been case hardend. The process is what I would say brutal, I have used them up to1/2" dia. You have to run the drill at high speed 1000 rpm plus and have the job bolted down, then apply a great deal of pressure and  keep it there until the work and the drill starts to glow red hot then the drill starst to cut through the steel like  it is as soft butter. It is a local anealing process. I have used them to drill holes in HSS hacksaw blades. Also tried them on broken taps but not had much suscess.
Thread: 2.5" steam association or society
28/07/2010 14:15:20
Nick
         This may help
 
Tomk
Thread: Digital editions of Model Engineer and Model Engineers' Workshop.
21/05/2010 23:18:17
 
I have been following this thread as a possible subscriber to the digital archive.
I am of the same opinion as most of the other posters that the reduction in
quality has put me off subscribing.
 
Out of curiosity I went to the Model Boats magazine site which is published by the same company. Same phone number for general enquiries as Model Engineer so assuming they are all one company.
 
My question to Model Engineering department is as they appear to be same company as Model Boats (No doubt I will be corrected if wrong) why does the model boat site still have the flexipage reader for their digital archives which gives you the better quality print.
 
TomK
Thread: Gear milling
05/03/2010 21:48:02
James
               There is nothing I could add to  John Stevenson answer. Just do as John says and only use 1 table and don't mix them.
 
TomK
14/02/2010 22:38:01
Meyrick
               I checked the dimesion on the cad drawings I did for this and it shows that on the cutters I made  from  the cutting edge to the trailing edge of the tooth is 0.021 inch clear.
 
I used the cad rotating fuction to check my dimesions and it shows that the tooth clearance is ok. When using the cutters there is no sign of rubbing on the cutters.
 
I have added a link to my previous post which shows a method of how this type of cutter is made. I just modified it from a 4 to a 5 tooth and used cad to work out the dimensioning
 
One other point I have only used this mandrel to make 20 dp 2 inch dia cutters I have not checked it out for other DP size cutters
 
Tom
14/02/2010 21:59:22
Neil Sorry I put Bills name on that reply.
The relieving mandrel I used was designed for 2 inch (50 mm) cutters.
 
This link takes you to the information to produce gear cutters using the method I used
 
 
Tom

Edited By TomK on 14/02/2010 22:17:34

14/02/2010 20:51:26
Bill
          The cutters in the picture  are relieved at the bottom is the mandrel that was used to relieve the cutters. The cutters are first turned as blanks using the buttons to ruff out the forrm.  
The slots are then cut. The slots are used to time the the cutter on the mandrel. 1 tooth at a time is releived. You must watch the depth you feed each cut to ensure all the teeth are the same from the center.
The method I use for the first tooth is to put marking blue on circumference and relelieve this first when all the blue us removed note the reading and then rotatate each tooth and releive to that depth.
 
The second part is to set up the buttons and releive to the calculated depth of the form.
one tooth at a time.
 
I have put up 2 more pictures of the releiving mandrel that may help you.
 
One more point the diameter of the cutter is important, when relieving you must make sure that the tool does not foul the next tooth.
Thread: steel price
11/02/2010 23:15:06
Trevor
              Compared to metal super markets prices I just paid for less bright bar of similar sizes it is excellent value if you have a use for it.
Thread: Gear milling
11/02/2010 23:07:37
Bill
If you look at the pictures in my album you will see a myford gear box I am working on
All of the gears were cut on a vertical mill using 20 DP cutters I made on my lathe.
The cutters were made from gauge plate using the button method which is decribed in  Ivan Laws book.
 
 
Thread: Latest article
08/02/2010 15:15:01
 
Tried to open the latest articles when you click onto the one for 3503-2 the
following web address comes up and you get a error message

http://www.model-engineer.co.uk/sites/7/documents/me-3503-3.pdf
 
If you change it to the one by changing 3 to a 2 at the end of the url you get access to the article
 
 
 

Edited By Katy Purvis on 01/06/2015 12:45:29

Thread: Hexagon holes
07/02/2010 21:23:07
There is an article in MEW 157 on making a rotary broach holder. Or a wobble broach as the writer calls it.
Thread: Model Engineer 4369
11/01/2010 21:02:42
Recived copy of 4369 today cetral Scotland. First  time in acouple of months that I have received it before the publication date usally receive it 5 days late. So pleased to get it early for a change.
Thread: Model Engineer 4368
05/01/2010 11:55:02
 
Good to see that some people are getting their subscription magazines by the publication date. It is now 6 days after that that date and mine has not arrived. This is the second month
It has been late by over a week. I live in central Scotland and there is no problem with the postal service as all my other post arrives ok.
 
Question for David
My question is:- Are the magazines sent out in batches over a few days or are they all posted on the same day.?
 
Tomk
Thread: Missing pages from back issues of Model Engineer
18/12/2009 23:56:38
I was browsing through the back issues of Model engineer and found that there is missing pages from Vol 199 issue 4304. The missing pages are 31,32,33,and 34.
 
Also on Vol 199 4303 pages  2,5, 7 and 56 are missing
 
Have these pages been ommited for any reason
 
Tomk
Thread: Model Engineer 4366
07/12/2009 15:52:16
Still not received my copy (Scotland) Anyone else still waiting for theirs.
Thread: Free offers with subsciptions
27/10/2009 23:49:07
Alan
           I received my caliper over a week ago, Maybe yours held up with the postal strikes.
Tom
Thread: Diamomd tool holder
29/09/2009 16:59:32
David
             Yes printed off the pages from the online magazine
Regards  Tom
29/09/2009 15:05:49
Just finished the tangental tool holder that is in MEW 156. This is tool works well on my myford lathe. Had to modify the holder to get clearance and centre hieght adustment to use indixon tool holders
It takes a 0.100 inch cut with ease, that is 0.2  inche off the diameter.

Edited By TomK on 29/09/2009 15:07:06

Thread: Tool and cutter grinders
14/09/2009 18:10:52
Circlip / Clive
Thanks for the reply.
My main use would be surface grinding but I also have a need for a tool grinding so a TC machine that can surface grind over 6 inches by 4 would be OK

If I could find a small surface grinder I'm sure I could grind tools OK. I don't have space for both a TC and a surface grinder.

The footprint of most surface grinders is to big for the space I have. The only one I have seen on the web that would fit is a Sanford which is a US make and I have not seen one for sale in the UK.
 
Clive
You mention a Union machine are these a small footprint surface grinder as I cannot find any information about them on the Web.
The information you supplied about the Chester has convinced me it would not be suitable.

The Boxford machine is the best I have seen so far and the space it requires is a Meter Square The Astra is just to big. The manual for the Boxford shows that it is capable of surface grinding as there is a mag chuck accessory available for the machine. The wheel feeds down onto the work but the only draw back is the down feed is not as fine as a surface grinder. But I’m sure I could live with it.

13/09/2009 17:54:41
Hi
 
I am looking at purchasing a tool and cutter grinder. I am looking for one that is capable of surface grinding over a 6" x 4"
 
I have identified 2 that is able to do this
1) Boxford G 200 Tool & Cutter Grinder
 
The other one I looked at is the
 
The boxford one is a solid built machine I have seen one of these in use.
And if fits my requirements
But are hard to find second hand and are more expensive
 
My Question is has anyone had any experience of the  chester machine.
Is it capable of surface gringing over the size I am looking for.
Looked on the web but cannot fined any information other than what is on the chester web page.
 
Thanks
Tomk
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