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Member postings for Donald Wittmann

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

Thread: Vickers 8" Howie pics as promised
23/04/2013 19:01:14

Hi Bob, The late production Tiger will be a cracking addition to your collection. Are they from kits as in Armortek, or are they scratch built? either way they are very impressive. I have the engineering drawings from Henschel [copies] they run to 37 sheets of a size that would be about A1 in moden sizes. they are of the King tiger with the Henschel /Krupp turret.. I hope you will post some photo's of your progress with the late version Tiger Mk6, If i'm correct would that be the version with the Cast steel road wheels?

Regards,

Donald.

23/04/2013 18:00:33

Hi Bob, I fully agree with Joey, that you are more than capable of building the Howitzer with out needing any help from anyone on here. Is time the demon? are you engaged on another project?

I would certainly do the heavy parts for you, but as I don't make models I would be out of my depth with the small parts. The 6th panzer division certainly seen a lot of action ,as did the Black Watch. Lets hope that we never have to go through all that.

Best wishes,

Donald.

21/04/2013 06:35:40

Hello Bob,

Just had a look through your albums, and am very impressed with your work and attention to detail. I especially like the photo's of the Konigstiger. A late relation of mine was a commander of a MK 6 in ww2. You are correct about the over engineering, but once the inital teething troubles were ironed out then they became awsome pieces of gear. Although I am of the opinion that the Panther was overall the more effective weapon. So once again great workmanship in all your models.

Best wishes.

Donald.

Thread: Inexpensive Chucks
04/02/2013 18:38:58

Joseph, TOS are the only half decent brand in your list so would be the best option.

as Brian said in an earlier reply try to get a second hand Pratt Burnerd or a Bison Bail, both are vastly superior to any on your list.

Donald.

Thread: when is a precision vice not a precision vice>?
25/01/2013 18:27:40

Kwil and Jason B, You obviously take some kind of delight in trying to belittle Alan Smith6 when he was only putting across a perfectly valid point. Whether he is or isn't capable of producing accurate work is neither here nor there. I have looked through both your albums and whilst quite impressive it does not give either of you any right to have a pop at the aforementioned poster. I get the impression that anyone who is critical of Chinese machines on this forum is labeled a "bad guy"

Maybe you should go the whole nine yards and sell the family Ford, Volkswagen, Honda or whatever and buy a Chinese car instead. I'm sure that with a little fettling and some user made replacement parts it will go reasonably well, oh and its cheap.

Donald.

Thread: Milling Machines
20/01/2013 18:41:48

David, Thanks for clearing that up. I think that 1 that would have to be adhered to [in Europe] would be the CE standard. I would think they would all meet that, It's just that I was curious about the mechanical standards.

Regards,

Donald.

20/01/2013 16:43:05

Just curious here, but I have just been looking through the ISO Standards for milling machines {ISO 1984-2:2001} manually controlled, table of fixed height, vertical spindle. And am curious as to whether the Chinese hobby machines have to adhere to these standards, or because they are for hobby use if the standards do not apply. I am sure that there is somebody on this forum who would be able to answer this.

Regards,

Donald.

19/01/2013 14:11:28

John, Point taken about Wabeco, they are few and far between on the second hand market [just spent an idle 45mins looking] It,s just that I am of the opinion that if you buy a machine you should not have to spend time or money in getting it to operate correctly ie, Gib strips that need lapping, bearings replaced with SKF / FAG or similar, colums not square / perpendicular, holes not lining up, now surely you must agree that these are some of the basics to get right? And yes I am also aware that even British, German and other European /Japanese makers have had their quota of "Duffs" but they are very few and far between. I have said this before and say it again, it all comes down to quality control or in many cases of Chinese machines lack of it., and until they address that issue the situation will not improve.

Regards,

Donald.

19/01/2013 11:02:06

Well said Steve Clark, I agree totally with your deductions. As for Arc, the guy is pleasant enough UNTIL someone starts telling the truth about Chinese machines and then you can rest assured that his sidekick Mr S will respond to back him up. The only difference between them and Laurel and Hardy is Laurel and Hardy were a laugh, this pair are a joke.

Ps, if possible look for a second hand Wabeco mill. first class Hobby /Light engineering gear. and then, [ And I don,t mean this offensively] you will be the limitation [ Which will be less and less as you gain experience].

Regards,

Donald.

Thread: Chinese Lathe Accessories.
15/12/2012 19:47:16

Alan,

I can't guarantee which threads a certain JS will not reply to but ,I can guatantee which ones he WILL and that is any that "knocks Chinese machines" Also Alan many chucks have steel backplates

Rohm offer steel ones in addition to cast iron ,as do Forkhardt and a few others.

Donald.

Edited By David Clark 1 on 16/12/2012 09:39:10

15/12/2012 16:02:16

Ketan.

I have not formed an opinion on these machines [production ones] from a model engineering aspect I have formed my opinion through many years in a production setting [look at my profile for more info] Yes, unfotunately I have had to use a couple of Chinese lathes on occasion [ thankfully not often ] and form my opinion on that basis. You mention there are chinese machines that can take on the best in the world!!! well that I would like to see. Glidemeister, DMG Broadbent Stanley Mori Seiki and others, versus the best China can offer , no contest i'm afraid ,China man last every time.

Donald.

Thread: Help need with Drill jig
25/11/2012 13:07:43

Gauge plate would be about the best for your needs, also no need to harden it.

Ah yes 3 microns, a tad better than a Bridgeport, agreed, but also about 30 times better than anything Mr Chinaman can produce.

Donald.

Thread: Problems with a plastic nut
16/09/2012 09:56:03

Holes in plywood, Pin spanners??? If you have the skill to make a replacement nut on the lathe then surely you would have the common sense to just "cut it off". By the sound of it the original is butchered anyway.

Donald.

Thread: Hydraulic rc Liebherr excavator: gear cutting query
23/06/2012 15:43:37

Hi Rebekah,

That is a very interesting project you have there. It certainly makes a welcome change from all the steam on here. Will the hydraulics be fully functional? Have you ever contacted Liebherr? I feel sure they would be very interested in your model If you were to contact them direct in Germany I feel sure that they could provide you with some more info that would be of use to you.

Keep up the excellent work.

Regards,

Donald.

Edited By David Clark 1 on 23/06/2012 15:43:54

Thread: Thread & Plug Guages
29/02/2012 18:03:19

Deltic007,

I would'nt worry about upsetting Mr prima donna. I have upset a few folk on here .

Maybe your "mate" would be better off getting a job in a circus. does Coco ring any bells?

You are correct that there are some friendly types here [but according to some I don't come into that catagory] although praise be, I'm not sensitive like your "mate"

Donald.

Thread: Myford ML7 Turning Between Centers
10/02/2012 16:14:25
John,
IF, as you say the bed has no twist, and I think we can safely assume that your headstock in not "pointing up" nor your tailstock "pointing down" then it points to bed wear
at the headstock end. If you run your DTI along the length of the workpiece then you will notice the reading changing. For every 0.01mm the reading changes then the part Ø will change by 0.02mm so if your part is 4thou larger in Ø at the headstock end that would be round about 0.08mm which means your DTI reading would change by 0.04mm.
If you are SURE that there is no twist, then stick in a piece of steel in the chuck and turn a 60° center and use a fixed center in the tailstock. then take new measurements and see.
if you still see a difference in Ø then run the DTI along the bed and that will confirm your bed wear.
EDIT. 
John,
            Depending on the amount of wear the part Ø will not necessarily be double the error. 

Edited By Donald Wittmann on 10/02/2012 16:19:13

Edited By Donald Wittmann on 10/02/2012 16:20:01

09/02/2012 14:07:24
John,
When you run the DTI along the workpiece unless your bed is perfect then you will notice it in your reading [bed wear] you would also have a difference in your original measurement. How did you measure the part originally? did you use a micrometer? or calipers[not good for precise measurements]. is it slightly larger at the spindle end?
you can have your centers spot on, but if you have bed wear [or a slight twist] then you will notice a difference, the more pronounced the wear the bigger the difference.
Donald.
Thread: Drilling hole of 0.0310" with deepth 0.91" of AISI 304L
04/12/2011 18:17:42
Les,
Agree, especially about " former member" certainly knows his stuff. and I could'nt see him making a song and dance about the question/questioner that started this thread.
Donald.
04/12/2011 17:29:38
Get off your soap box will you, The guy asked a question nothing more. I have asked structural engineers things on a couple of occasions and never have I been refused an answer. [and i've never been asked for money or given a bill]
Some on here should look for a job in " Billy Smarts"
Donald.
04/12/2011 15:45:04
Well said blowlamp, I just hope some hobbyists on here have to ask a professional [in whatever field] for some advice, and then get told in no uncertain terms exactly where to go.
I was not much use to the guy having never drilled such a small hole, I only enquired if he could substitute the 304ss but if I could have helped then I would have, it matters not one bit to me.
Maybe he would have been better served if he had asked his question on a professional forum.
Donald.
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