Half Hitch II mount with 8" Meade RC (photos!!!)

Here is the place to talk about all those equipment(Telescope, Mounts, Eyepieces, etc...) you have. Not sure which scope/eyepiece is best for you? Trash it out here!
Post Reply
User avatar
VinSnr
Administrator
Posts: 2310
Joined: Sun Sep 28, 2003 7:01 pm
Location: Andromeda Galaxy

Half Hitch II mount with 8" Meade RC (photos!!!)

Post by VinSnr »

I have been getting lots of request for the photos of the Half Hitch II (HH2) Alt-azi mount so here it is.

I actually tried to mount the HH2 onto the Bogen 3036 tripod but find the mating between the tripod and mount not very stable for a heavy scope like the 8" Meade RC. Note that my 8" RC has losmandy plate top and bottom, so it is kind of heavy.

Anyway here are the pictures:

Image

Comment : An extremely stable setup. If Skynet (from Terminator movies) were to make a mount, it will probably look like the HH2.

Image

Comment : I got the Oberwerk Wooden tripod instead and this tripod is really stable. The wood is really beautiful to look at, the photos can't do it justice. A steal at US$75!!

Image

Comment : From the front of the scope. Here you can see the azimuth encoder

Image

Comment : Here you can see more in detail on the azimuth encoder, the bubble level and the azimuth slow-motion knob behind. Notice the very neat cable routing.

Image

Comment : Above you can see the azimuth knob and the azimuth brake at the side. I rarely use that brake. However, the motion of the knob is so darn butter smooth.

Image

Comment : Now the above is interesting. You can see the azimuth bearing being rub against the "pin" from the azimuth knob. You can also see below the mount, there are 3 nylon screws which act as a stopper and stop the mount from rubbing the top of the tripod. This prevent marring. The HH2 is being threaded on top pf the tripod through a 3/8" bolt.

Image

Comment : The above is a view when the sky commander in the fold back position. Notice the neat cable routing again from the sky commander to the altitude encoder. You can also see the altitude knob and the altitude caliper brake

Image

Comment : In the above, you can see now how the altitude knob rub against the altitude bearing. Behind is the caliper disc brake which you can use if you want to maintain balance when you change eyepieces

Image

Comment : The above is a close-up of the dovetail attachment. Notice the scale marking on the dovetail plate so that you can always put back your scope in the same balancing point.

The Half Hitch mount requires two kind of balancing. First is the aft-front balancing which everybody is familiar especially for those who uses Giro mounts before. The 2nd balancing is a little more cumbersome....and it's the up-down balancing. You point the scope to zenith and you let go. If the scope moves, then you need to move the clamping jaw either vertically higher or lower. Do this until the scope maintain balance when pointing at zenith. You only have to do this once. Once this is done, then proceed with the aft-front balancing which is easy to do.

Once everything is balance, the movement is like a dream. You won't believe how smooth this is. The knob moves the scope without any jerk or backlash. The only problem is that it is very sensitive to balance and there is no clutch or tension knob for you to compensate. So if the weight range of your eyepieces is very wide, you will need to purchase the balance trimmer from Half Hitch. That would probably solve some balancing issues when you change from super light eyepieces to super heavy ones. I find that if your eyepieces have a difference of more then 100 grammes in weight, you will need that balance trimmer.

Once the balancing is sorted out, the HH2 mount will leave every GIRO mount out there looking obsolete. I have been using all kind of GIRO mount before...most of them are good and smooth but none is as smooth as the HH2. The best advantage is the slow motion knob.....you will appreciate this knob when tracking an object say at 200x. I did this with Jupiter and it is effortless!!! No more second guessing on how much should I push and face issues like jerking and stuff.

Great mount and wonderful service from Charles of HH.
User avatar
weixing
Super Moderator
Posts: 4708
Joined: Wed Oct 01, 2003 12:22 am
Favourite scope: Vixen R200SS & Celestron 6" F5 Achro Refractor
Location: (Tampines) Earth of Solar System in Orion Arm of Milky Way Galaxy in Local Group Galaxies Cluster

Post by weixing »

Hi,
Nice introduction and wow... what a beautiful alt-az mount... :)
VinSnr wrote: If the scope moves, then you need to move the clamping jaw either vertically higher or lower.
What does this mean?? You mean you can move the clamping jaw itself... not just the dovetail plate??

Your scope look way back heavy especially after the 2" diagonal and eyepiece, can still achieve balance using this mount?? I think lots of SCT user will have similar problems.

By the way, any idea what is the maximum aperture and OTA length that this mount can support before the scope hit the mount base when point at Zenith?

Have a nice day.
Yang Weixing
:mrgreen: "The universe is composed mainly of hydrogen and ignorance." :mrgreen:
User avatar
VinSnr
Administrator
Posts: 2310
Joined: Sun Sep 28, 2003 7:01 pm
Location: Andromeda Galaxy

Post by VinSnr »

weixing wrote:Hi,
Nice introduction and wow... what a beautiful alt-az mount... :)
VinSnr wrote: If the scope moves, then you need to move the clamping jaw either vertically higher or lower.
What does this mean?? You mean you can move the clamping jaw itself... not just the dovetail plate??

Your scope look way back heavy especially after the 2" diagonal and eyepiece, can still achieve balance using this mount?? I think lots of SCT user will have similar problems.

By the way, any idea what is the maximum aperture and OTA length that this mount can support before the scope hit the mount base when point at Zenith?

Have a nice day.
Yes, the clamping jaw can be adjusted vertically. There are a few screws behind the altitude bearings which are use to adjust the clamping jaw.

To adjust the up-down balance, first point the scope to zenith. Then, release the altitude grip (meaning the altitude knob pin will not be rubbing the bearing) by pressing a special handle on the arm. Once the altitude grip is released, the scope will start moving clock-wise or anti clockwise. Adjust the clamping jaw vertically until the scope is stationary. This adjustment will take some time because you got to remove the scope from the jaw, adjust the jaw, then put back the scope and try again. Cumbersome but only need to do once.

Yes you are right that the scope could be back heavy when the diagonal and eyepieces are attached, but there is also a 12" long aluminum dewshield in front of the scope (which I did not put up during the photo-taking). The current setting is meant for having the dewshield in front and the diagonal behind. No problem with the scope balancing this way. Whatever the configuraiton is, just do the 2 balancing step (up-down and aft-front) and the HH2 will handle it.

The HH2 is definitely meant to be optimal for 4 - 5" refractors. Actually the 8" is already almost max. The scope will not hit the base because the mount comes with a zenith stopper (look at the last photo.....there is a plastic white screw on the altitude bearing, this screw will act as the zenith stopper so that the scope won't bang onto the base). The 9.25" OTA may still be possible, but you may have to sacrifice the last 10 degrees of the altitude. Not much issue unless you look at zenith all the time.

Anymore questions, please shoot.
User avatar
rlow
Posts: 2401
Joined: Fri Oct 31, 2003 7:36 pm
Location: Jurong

Post by rlow »

May I ask what is the averaged damping time if you give a sharp tap on the eyepiece end of the Meade 8" RC?

Also, what is the total weight of the HH2 mount?

When are you ready to sell this HH2 mount? Haha! (Just kidding... I have no intention to get this, as I already have lots of AZ mounts.)
rlow
User avatar
VinSnr
Administrator
Posts: 2310
Joined: Sun Sep 28, 2003 7:01 pm
Location: Andromeda Galaxy

Post by VinSnr »

rlow wrote:May I ask what is the averaged damping time if you give a sharp tap on the eyepiece end of the Meade 8" RC?

Also, what is the total weight of the HH2 mount?

When are you ready to sell this HH2 mount? Haha! (Just kidding... I have no intention to get this, as I already have lots of AZ mounts.)
Average damping time is less than a second probably on a 65X eyepiece.

Total weight of the HH2 is around 5 pounds.

Just notice that the HH2 vendor is using my photos on Astromart!!!

[smilie=admire2.gif]
User avatar
10,000rpm
Posts: 170
Joined: Wed Mar 18, 2009 9:35 pm
Location: Changi Prison....area

Post by 10,000rpm »

VinSnr wrote: Just notice that the HH2 vendor is using my photos on Astromart!!!

[smilie=admire2.gif]
And why not? They are beautifully taken especially the first one at the top! [smilie=admire.gif] On second thoughts, they should have asked your permission as you own the copyright! Haha.
Post Reply