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Member postings for Nyrup Boegh

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

Thread: Carbide tip parting on Sieg C3 lathe
03/04/2016 06:19:30

Hi

Thank you to all participants in the debate of the subject.

I have now managed to get a little time in my own workshop and tried the tools I ordered from Arceurotrade.
They worked very well indeed.
Yes, there were some chatter from the 2mm parting tool, but it realy didn't matter.
The small aluminium thread-bushings I was making parted off verry well.

When I part off on lager lathes (Colchester, Victor, Weiler and Haas CNC) I keep the rpm in the range of 300-800rpm. I did the same on the Sieg C3 minilathe.
Also - as mentioned by an other participant - the tip should not be above center hight
but rather a bit below centerhight.

Regards,
Nyrup

12/03/2016 07:59:52

Hi

Yesterday I ordered some turning tools from Arceurotrade from the "new" cheep series in the catalog. All with the 8mm shank.

I was a bit hesitant in ordering the parting blade (with the 2mm GTN2 insert) and holder, but finally decided to order it.

But the doubt is still nagging me: Does it work on my small Sieg C3 lathe or will the result be chattering away and biting at me...frown ?

Nyrup

Thread: Milling Machine Tramming
25/06/2012 09:10:05

Hi Russell

Thank you for your tip. I will surly remember the tip. I have been thinking of something similar but had not thought about removing the head- column assembly from the base and how much easyer that would be compared to lifting the head off the column and replacing it to measure. Also I have read about the method of averaging the measurements readings of the bar and gaining accuracy in that way. But I had forgotten the method. Surely it was good to get the memory refreshed! smiley

By the way. I have been tinkering with the tramming since my last post and somehow I have slowly
managed to get the column/ base/ x-table to a right angle at a much larger degree of accuracy than before by shimming the column-base connection at some other points and with various thicknesses of shimming.
The funny thing is that this helped both on the column/ base/ x-table angle and did to a large degree also remedy the tramming of the spindle.

Now I will continue to use my mill and check how good or bad it performs.
I surely (think that I) know much more about how to tackle the tramming by now compared to when I started this thread. smiley

Kind regard,
Nyrup

20/06/2012 15:54:38

Hi

Thank you for your concern and your comments.

I have thought more about this tramming business and come to the conclusion that "Stub Mandrel" mention: I can't shim the column to remedy the problem that I have.
Yesterday I did some more milling. I was making some T-nuts. It worked out very fine no problems at all. I did some check to of the column and the base.
It appears that the column is at an right angle to the ways of the base. The ways that the X-axis travel on is at an right angle to the column - or were till I shimed the column/ base connection.

So the problem must be in the remaining assembly somewhere.
I'm afraid that it will be almost impossible to fix that in a proper way - at least for me - by myself.
Perhaps I will contact Arc...
Well... Anyhow... It is possible for me to work around the problems and the SX2+ is very capable of milling in plain black steel. The material I have used so far.

Kind regard,
Nyrup

18/06/2012 13:01:08

Hi

Once again, thank you for your answers.
If I were living in England in traveling distance from Arceurotrade, I am sure I would drive by and talk with them. If I had to by the Sieg C3 and SX2+ here in Denmark it would probably have had the name Rothwerk and have been sold by people who had not got a clue of what they were trading... ;o)

I bought from Arc because even with postage included money was saved compared to fx. Rothwerk and the SX2 with R8 spindle is not available at all.
I were a bit anxious about the fright. Would the machines be damaged.
Well, on both the lathe and the milling machine the bottom of the plywood case did not withstand the heavy machine during the travel. In both cases the plywood cracked and was splintered but the band around the case did hold it in place and no damage seems to have happened with the machine itself, so i guess that it is not this fright problem that is the course of inaccuracy.

I have already dismantled, cleaned and lubricated the complete X/Y table.
Also I did that on the fine-downfeed (z-axis) mechanism.
The head I have left on its own as everything seems to function ok and I assume that the bearings in the spindle are closed sealed entities and as the SX2 is belt driven there is not much to do inside the milling head.
​I did however encounter a problem with the x-travel. At the leftmost end of the table it binded so much even after cleaning and lubricating that I clearly had to do something about it.
I "bit the cake" and used some sanding paper - I did not have any emery cloth - and sanded the dovetail in the left end. In a matter of an hour or so I managed to get it sliding smoothly and the surface were considerably more smooth than the original machined surface from the Sieg factory.

The machine was, as you might already have guessed, bought new. But as the fright is expensive and troublesome the possibility of returning the machine is not an option.
All of this I did consider even before placing my order. I took the chance and did perhaps not exactly win the lottery.
I am not keen to make irreversible changes to anything and certainly not when I am not sure how to do it and if I am making more damage than remedy.
Therefore I think that I do have to stick to shims and probably an aluminium plate that I can machine to a right angle and level workspace on the milling table.
Aside from these troubles I am happy with my purchase.
Had it not been for the Sieg factory I probably would never have fulfilled my dream of a metal lathe neither a milling machine.

Kind regard,
Nyrup

18/06/2012 08:25:13

Hi

I have now investigated the tramming further.
I must say that as it looks now it does not look good at all with my Sieg SX2+ !

I'm not done with all your recommended tests, but partly so, my conclusion is that the surface of the x-table were at an right angle to the column but the y-axis motion or traverse were not at at an right angle to the column. The result were that the distance from the tool in the spindle to the work piece were not constant when traversing the y-axis.
I have now shimed column/ base connection so that the y-axis traverse is at an right angle to the column and thus the distance is the same from the spindle to the table during the traverse.
The downside is that the table surface is no longer at an right angle to the column.
The head tramming is out too. I have done the "L-bar test".
Of course when the table is not at an right angle to the column I can not expect it to be parallel to the head or the spindle to be perpendicular relative to the table surface.
As the only way to correct this seems to be both a surface grinding of the table and a process of dismantling the total milling head assembly and trial and error with shimming in the head mounting when reassembling the head I am either looking forward to a very tedious and time consuming job or trying to live with and working around the shortcomings of the milling machine.

I wonder if every small from Sieg is this inaccurate or I am expecting to much - or perhaps overlooking something or misinterpreting something.

Yesterday I was milling some steel in the process of making some more T-nuts.
It looks like the work piece is now being milled to an reasonable state of right angle.
Something that was not the case before the shimming.

Kind regard,
Nyrup

11/06/2012 07:55:58

Hi

Thank you for you answers.
I must admit that I did not use an "L-bar" in the collet/quill. I used a magnetic base fixed to the underside of the head and traversed the Y (topslide) of the X-Y cross table.
I guess that perhaps I in that way measures the cross table and not the head/ column alignment.

When I get the time (hopefully in the weekend) I must try both the square method and the L-bar method. I think I can unscrew the bar-pillar system from my magnetic base and use that in a collet or the drill-chuck.

I'm not sure that I have shims that is thin enough. I have a roll of 0,1mm shim. Perhaps I could use thin paper as shim? Would that feasible?

Kind regard,
Nyrup

10/06/2012 14:07:07

Hi

I have now done some milling on my SX2+ milling machine that I bought lately. I have done some measurements to. Using a Dial Indicator I can measure that the "noding" (Y-axis allignment) is about 0.119 degree, calculated using trigonometry from the deflection of the DI (0.25mm over a distance of 120mm travel of the Y axis).

The question is: Should I try to fix this. The column is bolted to the base. If I have to adjust it I must try to insert some shims between the base and the column. I anticipate it will be difficult to do and to get it right.

Has anybody any experience in doing this kind of tramming work on a SX2+ or similar machine?

Kind regard, Nyrup

Thread: Endmill vs. Slotdrill
24/05/2012 07:10:19

Thank you to all for your kind answers.

It is most helpfull. I think I will by a 2 flute endmill/slotdrill and try that. I do not take verry deep cut's on my small mill neither on my small lathe (Sieg C3). So far I have not had any problems and get the result I expected. But - then - the precision demands have not been wild in the small items I have made till now.

Kind regard, Nyrup.

23/05/2012 07:51:23

Hi

I have just bought a small mill (Sieg X2+)

I have bought several books from the Special Interest Model Books series. They are verry good. Amongst the books i have bought is several by Harrold Hall. I am reading "Milling - a complete course" and "The Milling Machine". I have just made my first clamp pr. the instructions in the milling cource book.

I have 3 endmills: 3mm, 5mm and a 10mm. In the clamp I have to make a slot 8mm wide. I made it by drilling an 8mm hole in each end of the slot and milled out the in between using the 5mm and gradually widening the slot to 8mm. I am thinking of buying an 8mm endmill in a lokal shop in Brovst here in Denmark. The endmills I allready own i bought at Arceurotrade. But I am not shure which one to choose. The lokal shop has both 2 and 3 and 4 flute cutters. What is the benefit from each? What is the difference in practical use? Why are endmills cutting oversize and slotdrills not? How do they differ?

I have searched the forum and found this thread:

http://www.model-engineer.co.uk/forums/postings.asp?th=45899

but I do not find the answer to my question in the thread - at least I am not shure the answer is in the thread.

Does someone have a link to an explanation on the net or in MEW (I am a digital subscriber to MEW).

Kind regard, Nyrup.

Thread: Opening DE MEW187 in Firefox
17/02/2012 08:37:17

Hi

Thank you for the answers.

I have checked and MEW Issue 187 opens in Firefox in my Ubuntu 11.10

installation. The problems seems to be in Lubuntu, both in ver. 11.04 and 11.10.

Again in Lubuntu I am able to open Issue 187 in Chromium.

The strange thing is, that as far as I see the problem is only with issue 187 and

therefor I am tempted to conclude that there is some kind of

difference in the format in Issue 187 compared to the other issues.

I guess there is now way that I can check this. The only way is if the

publisher could check this.

By the way all my Linux installations are updated.

Kind regard,

Lars-Peder

16/02/2012 07:45:42
Hi
I am a new subscriber to MEW.
I live in Denmark and the Digital Edition of MEW
MEW suits me perfectly. Now I don't have to
worry about the delivery. Our postal system
in my country is absolutely not what it used to
be just a few years ago. Now it is not uncommon
that mails and magazines is not delivered to
the person it was supposed to be delivered to.
The reduced price of the Digital Edition is
also very much appreciated.
I have so fare had no problems opening the
issues. I have already in this first month of
my subscription read many interesting articles accros
many issues reaching back to the first issue of MEW.
However there seems to be a problem opening the
latest issue (187) when i use the browser that i use
most: Firefox.
I am using Linux (Lubuntu 11.04, Lubuntu 11.10 and Ubuntu 11.10)
and Firefox 10. I have discovered that using Google Chromium
I am able to open Issue 187.
Has anybody had this problem with Issue 187?
Kind regard,
Lars-Peder
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