CurtPalme.com Home Theater Forum

[johnsmith808]

Hello,

I haven't gotten my G70 yet, but was wondering how I could use unistrut to mount a G70. The biggest question is what holes on the pj can be used to hold the pj up. Is it only those holes for the OEM ceiling mount? Are the holes that have the projector feet in them not strong enough to hand the pj by?

I saw the thread about mounting the Marquee with eye bolts, unistrut and pipe. Was hoping a G70 could be mounted the same way.

Also, it seems like the threading for the G70 is metric. Does a Home Depot or Lowe's sell such eyebolts?

Thank you.

[rabies_70]

ONLY use the mounting bolt holes. If you try to use the foot holes, you will destroy all that is good in your life.
Homo depot sells some metric stuff, yes.
Is the mount on ebay still for sale? if it is you should score it

[outwest]

I would be surprised if the normal home improvement outlets would have eyebolts with a metric thread. I get a lot of my metric and British hardware from Metric and Multistandard Corp. They have a great selection of hardware. I think that I saw some eyebolts in their catalog and the eyes were full circle (probably forged) not just the bent round stock that is the usual fare at a regular hardware store. When you know what you need, I can give you contact information or look it up in the catalog.

[johnsmith808]

Thanks for the heads up. I had a feeling the holes for the pj legs weren't strong enough.

Instead of using the official ceiling mount, can you just use unistrut for the ceiling and perpendicular on the pj connected to the mounting holes?

I just came back from Lowe's and they had no metric eye bolts. I think I will need to order those for sure. I'll take you up on your offer once I get my pj in, unless you already know what size the screws need to be for the G70 mounting holes.

[johnsmith808]

I was looking at the G70 manual. It says that the thread for the mounting holes is M8. What does that mean? Is M8 a certain number of millimeters(20mm?).

[outwest]

M8 means metric and a nominal thread diameter of 8 MM. The most common 8MM thread has a pitch of 1.25 MM. This means that there is 1.25 MM from one thread to the next. I looked in my catalog today at work and there are two styles of eyebolts. They are not the typical eyebolt that one thinks of buying at a hardware store. A better term might be "lifting eyes". They might actually be more difficult to use in mounting a PJ, although there would be no question about their strength being up to the task. The eyes are seamless. The carbon steel ones are drop forged. They are also available in brass and stainless steel. I will try to post a picture from work tomorrow.

[johnsmith808]

Thanks for that explanation. I was getting completely confused with those terms.

I guess I would need 4 of them to screw into the G70. I was going to try to use the concept in this post:

https://www.curtpalme.com/forum_archived/viewtopic.php@t=8576.html

Do you think that the metal pipe would cause any magnetic interference?

[garyfritz]

Possibly a little, but your projector can easily compensate for it with its convergence controls. As long as the magnetic field from the pipes doesn't *change* (which it won't), no worries.

If you want to reduce the chance of any magnetic flux in the pipes, either get a demagnetizer, or use the low-tech approach: hold the pipe pointing north/south. Whack it on the end with a hammer 3-4 times. Turn it east/west. Whack it a few more times. Do a few more at NW/SE and NE/SW if you're obsessive. That should randomize the magnetic domains enough that there will be little if any remaining magnetic field. (Or you could heat the pipes to their Curie temperature, but you probably don't want to roast them at 1418°F. )

[hailtoby]

[Brian Hampton]

My G70 is mounted with uni-strut. I bolted 2 rails to the projector and bolted 2 rails to the ceiling joists and then bolted them all together. I wouldn't use pipe like in the thread you posted. I've just never done it that way and never would. I just have the rails on the pj going perpendicular to the rails on the ceiling and then bolt it all together. With longer bolts I can very the throw angle of the pj to minimize keystone distortion.

Hardware stores sell the M8 bolts so everything should be easy. But,... ask as much as you like about this as ... safety for you and your projector is critical.

-Brian

[garyfritz]

The pipe approach has the advantage that it's easy to move it front/back and side/side. But it ain't pretty.

Unistrut doesn't let you move the pj that easily, but you should know the correct location of your projector before you hang it!

[outwest]

Here are some pictures of the eyebolts listed in the catalog that I have. As you can see, the one style has a very small ring. It might be a problem to get a piece of round stock that is strong enough---stiff enough to hang the projector on. The style with the larger ring might not have a long enough shank to give some drop distance. There are probably more "normal" eyebolts available, but this is all that I have listings for. A Google search might find something better or there are a number of ways something could be fabricated. Anyway, the phone for Metric and Multistandard is: (800) 431-2792

[johnsmith808]

Thanks everyone for the help. Also thank you Outwest for that information. Those look like some super duty eyebolts, but I think you might be right about the size. I'll try to search the net for something that might work.

Garyfritz, that's something I never knew before. I'll give the pipes a few whacks just to be sure.

One thing I'm also considering is how to adjust the tilt of the G70. With the eyebolts screwed in and pipes in the eyebolts, you can't really make any tilt adjustments, right?

What about using a turnbuckle? You can make tilt adjustments pretty easily I would think.

[enricho21]

I've used turnbuckles in mine and it works well. The top of the turnbuckle, the treaded eyelet I had with a saddle clamp going through the eye and then two unistrut channel nuts, one on either side of the saddle clamp. The good side effect of this was that the channel nuts could not accidently when making adjustments twist and release, they could only come out the end of the channel. On the other end I cut off the eye from the turnbuckle and threaded it directly into one unistrut channel nut. You need to do this at the right end because one thread is left hand and the other right hand in turnbuckles. I've covered it with a piece of cable tube cover that is split down the back, they kind of look like the front shock absorber covers on dirt bikes only smaller. Overall it works well in my install.

[ILOVEMYTHEATRE]

Hi there is one on eBay may save you the hassle
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MESELX:IT&item=320314111536

[John S]

I used that same factory braacket on my D-50. It made the whole process of installing and tilting very simple. If you are going to bolt the unistrut to the ceiling why not just bolt the factory bracket to the ceiling instead.

[DB Cooper]

I happen to have a G-70 mount and no G-70, so if you are interested in getting one shoot me a PM.


John

[johnsmith808]

One problem I have is that where I am going to mount the projector, there is a 12 inch beam going across the ceiling. I plan on mounting it behind this beam, thus the pj lenses need to be at least 12" from the ceiling. It looks like the factory mount will be less than that.

Is the only option for the factory mount to be flush with the ceiling?

[NewbieDAN]

[Zebu Fellenz]