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Physopto last won the day on March 22 2016

Physopto had the most liked content!

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About Physopto

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    Brown Dwarf

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    Malt Whiskey, as an aid to seeing stars.
  • Location
    North East
  1. Wedges are a problem waiting to bite you in the rear end. On top of this they make the whole mount very shaky because of the extra weight on the already poor legs. At least that is what I found with my Celestron 5SE. Mind you it was a wedge built in to the mount. But I also had a wedge for my LX200 12" Meade and was never happy with that either. Then there is alignment to mess with. Nice scope but legs a problem! Derek
  2. As you call it the "amended first version or burnt yellow". I know you are not fussed on the colour but I think it is the best with the most clear definition. A cracking shot. Derek
  3. 2nd effort is in my mind the best of the lot. Very nice image with lots of detail. Well done Carole. Can't wait for the Galloway Star camp to try to more data for my attempt at this. Only managed a few subs of Ha so far. Derek
  4. I would like to point out that there a few well respected suppliers of mounts who actively take up to several years to fulfil orders!! Admittedly they have a good track record, BUT! I know having been an engineer for many years it can be difficult to get every size correct without having to rethink items and how they will act or function together. The 8 parts I had made were pondered over for some time and re-jigged in my mind many times to try to ensure that they all would fit without problems. I was in no huerry but this still took some weeks to be sure I had not made any glaring mistakes, as it costs money to fix mistakes and time! You can design almost anything, but you also have to know if the present CNC machinery you own or hire can actually make the parts. A new mount will prove many times more difficult than my few parts. I do not have access to CAD so it was all done the old way on paper first then in Word. To be quite honest the last time I actually did a formal complex engineering drawing using "T square" and paper was in 1970 during a 6 hour marine engineering exam for my Seconds Part A certificate of Engineering. Late on, I did learn to use a CAD program, but that was over 20 years ago, but have not used one since. I know the modern programs make life a lot easier once properly understood but you still need a high degree of understanding to use them effectively and efficiently. I am not making excuses for Mark, but development takes time. Hence there will be many pre production efforts. So :- Direct quote from Company Seven for an Astro Physics mount, I have highlighted a bit of their text!! Quote. Once your order is placed, sit back and relax anticipating the arrival of a true expression of fine craftsmanship and your rights to brag about how long you had to wait for yours. It has been common experience among our clientele that the time will go by faster if you can find a way to put it out of your mind; sending frequent E-Mails or calling asking for the production status will not make the work go any faster and tends to make the agony appear prolonged. The owner of Company Seven once ordered a 7" f/9 Apo telescope in February of one year for himself and later forgot about it so that by April of the following year, while reconciling orders, he was questioning whether or not he had actually ever placed that order with the factory! After being reminded that he had placed the order, he was condemned to be in agony with anticipation from then until delivery later in the year; incidentally this instrument is now at the University of Maryland Observatory. Remember: "Roland Christen will send no product before its time..." End quote. And these mounts are in full production not being actively developed or in RND. Derek
  5. Cut out the frivolity you lerts, this is a serious thread. Errr well, supposed to be!
  6. So Kenny is pitching a tent to be safe due to Corona then. Bit of a change to the norm, but safer. We will all have to be on the alert.
  7. Since posting this, bar one short post, I have kept quiet and watched a fair few people commenting on JTW Engineering. I mostly prefer not to comment on things I know little or nothing about. I do hope that the mounts promised and I believe paid for do turn up and work really well. The reason for this post is that Mark of JTW Engineering contacted me shortly after the above post. I was surprised but grateful for his email. In that email he said hat he was sorry that things had not gone according to expectations and wanted to make things right between us. As I said I was surprised, but thought why not give him another chance. It has taken a little while as I had to find the original drawings, but a few emails later Mark said he was getting the faulty part remade. There have been a few delays, but I would guess he is busy with other promised items. A few days ago the part arrived with me. I could not check it out properly due to weather but today I did. Mark had said that if the threads were not quite right it may be because he had hand ground the original tooling. But he would remake any faulty parts as soon as he knew about the results. Now he had factory supplied tools so any threads should be perfect. To cut a long story short, the threads, were perfect and screwed on to the other part previously supplied without any problems. I now have a working setup without the part I had to adapt, along with all the other correctly machined parts as originally ordered. There were 8 parts in all and some of fairly complex shapes. They were designed to fit on my Takahashi 85mm between the Feather Touch Focusser and the powered Pyxis 3" rotator. After the rotator they were designed to allow fitting of an Starlight Xpress AO unit, OR a spacer could be fitted in its place and then on to the QSI 683 wsg CCD. I designed the parts so that the AO and/or CCD could be rotated to any position regardless of any item in between. I am attaching some diagrams and photos to illustrate my ideas. In practice every thing has worked as designed so far. I originally looked at Precise Parts in the USA. I sent an email with some specifications to them but their answer was to tell me I had not given them some data. I pointed out that it was in the original email and to actually try reading it properly. After that they refused to answer any emails I sent to them. EXIT Precise Parts !!! I estimated their costs to me to would have been in the region of $1500 or more. Mark has done the same and with extremely precise dimensions (checked by me) and his prices were much lower! In the end, OK there was some bad and long delays for whatever cause? But I now have all the parts well machined and in use exactly as requested, doing their job perfectly. I hope this gives hope to those awaiting his new mounts. Derek ( Parts 1,2,3,&4) Male Optec threeand a half inch to 72x1mm swivel adaptor (11).pdf (Part 5 ) A.O. Unit to 2.156 inch x 24 tpi.pdf (Part 6) Tackahashi 72x1mm to 2.156 x 24 tpi CCD adapter (final).pdf (Part 7 ) QSI ccd camera adapter for 2.156 inch x 24 tpi.pdf (Part 8)QSI end cap drawing for STL 2.156 inch x 24 tpi.pdf
  8. Nothing better than a DOB. I must admit that. DOB,s are so versitile, take Damian's device as gravey is just so important to the smooth flow of pleasure at a star Camp. A DOB can do about anything you can think of, I know from long experience. D. O. B rown
  9. Hello Everyone. I have just been informed tonight by Lesley the Galloway Site owner that all 25 pitches are now filled for the next Autumn Star Camp. But please, if you are interested, just telephone Lesley up to book pitches on the hopeful chance that more may become available if the Scottish Government feel that they can relax the Covid rules further in the future. As I said the camp is still 5 months away as yet and a lot can change in that time! Hopefully for the better Derek
  10. Depending upon the diameter of the pin holes you can often use long nosed pliers in the holes and use a screwdriver slotted between the open jaws of the pliers., or use a spanner across the plier body (not so good). I usually make tools for these type of jobs from steel bar and needle gun pins. Derek
  11. Steel can rust far too easily unless properly prepared. I really would suggest either stainless steel or even brass or aluminium. I suggested the stranded fibre glass compound as it is far easier for most people who are not accustomed to fibre glass repairs to accomplish. U-Pol stranded glass repair compound is easily purchased and only requires the hardener in the correct quantity to set it off. But be sure to prepare all surfaces before starting and have all tools at hand. It will start to harden off very quickly depending how much hardener you use. The ambient temperature can be a big factor. I suggest testing with a small quantity before actually doing the job, just to get your timings correct. The compound is far easier to use than glass matt or stranded matt with liquid resin. If you do go the route I suggest be sure to put a thinish layer of the stranded matt compound on the underneath surface and hold the metal firmly squashed into the compound until set. Then finish with a second layer over the top of the metal and compound forming a sandwich. You can smooth it off with some soapy mixture just as it sets with a leather glove and spatula. Watch your fingers as the glass can go through most things. Once set ( around 10/15 mins ) you can sand it smooth. Anyway hope it all goes well for you. Derek
  12. Looking at your picture of the damage, I would grind off the surface by the wheel and use stranded fibre glass repair. You can also bond a stainless steel plate across the back for added strength under the stranded fibre glass at the same time. Once that is done, I would then repair the outer surface as it will then have some strength and be able to be ground out for the final refinishing. Once accomplished you can sand down to the required level and apply a final correctly coloured gel coat. When dry/hard buff off to give an invisible repair. I have done this several times on Life Boats at sea. Derek
  13. Excellent !! Keep in touch, stay safe, see you hopefully ASAP. Derek
  14. At least someone has read the post ?..........I hope ! It is hard to tell if those it is aimed at are actually reading and digesting the message at times. Rather than skimming through bland white script and possibly missing the important bits. As some one has said Unprecedented Times Derek
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