|
Forum Rules | Firearms Safety | Firearms Photos | Links | Library | Lost Password | Email Changes |
Register | FAQ | Calendar | Search | Today's Posts | Mark Forums Read |
|
Thread Tools | Search this Thread |
March 19, 2018, 12:41 AM | #26 |
Senior Member
Join Date: November 5, 2016
Location: DFW, TX
Posts: 1,147
|
The granite has a lot of inertia.
Inertia..., that explains it. Forgot my Physics 101. |
March 19, 2018, 09:20 AM | #27 |
Staff
Join Date: March 4, 2005
Location: Ohio
Posts: 21,060
|
Yes. It is hard and rigid, so it conducts sound, but it is massive enough that outside vibration doesn't easily give great magnitude to its movement, especially not at lower frequencies. But adding the carpet really takes away the bench's ability to pass vibration or sound to it.
Also, since we really just interested in the mass of the plate, high quality isn't important. You may want an American or German or Swiss or Italian or Japanese made scale for quality, but they all have leveling feet, so the granite doesn't have to be any flatter than a tombstone. Flatness matters if you are going to use it as a base for measurements. In that arena, AA is about twice as flat as A which is about twice as flat as B. B, up to 18" in the longest dimension is flat within two ten thousandths of an inch (0.0002"). The bigger they are, the more the spec opens up, but you can see why there is no need to pay for something flatter than B, which is the lowest grade you can get. A concrete block is also pretty effective. It lacks the official appearance of a granite plate, though, and the plate has other uses. Before MSC bought out Enco, they were a good source for inexpensive import surface plates. This place seems to have what they did. I note on the largest plates the shipping is more than the cost of the rock.
__________________
Gunsite Orange Hat Family Member CMP Certified GSM Master Instructor NRA Certified Rifle Instructor NRA Benefactor Member and Golden Eagle |
March 19, 2018, 10:29 AM | #28 |
Senior Member
Join Date: March 1, 2009
Posts: 4,232
|
As I said earlier, want a cheap piece of granite just go down to anyplace that cuts kitchen/bathroom granite counter tops. When they cut the holes for the sinks or trim a piece slab to size for the counter top they toss the scraps out back. At least in my town. I bought some for some jewelry boxes I was making, $10 bought me more than I really needed, it was just scrap to them. It won't be to lab grade quality but for what it would be used for it will do
__________________
“How do I get to the next level?” Well, you get to the next level by being the first one on the range and the last one to leave.” – Jerry Miculek |
March 19, 2018, 12:54 PM | #29 |
Senior Member
Join Date: September 20, 2017
Posts: 197
|
Prime has really spoiled me. This was the largest block I could find with free 2 day shipping. It came in a wooden box that added some weight, so I would guess it was 40 pounds or more.
|
March 22, 2018, 12:31 PM | #30 |
Senior Member
Join Date: November 5, 2016
Location: DFW, TX
Posts: 1,147
|
Cambridge electronics is having a sale on the FX-120i. $500 upfront with a 30% rebate from A&D Weighing until 31 March
scale - https://ce-products.myshopify.com/pr...-122g-x-0-001g rebate form https://cdn.shopify.com/s/files/1/11...51572619742801 that brings the final price to $350 dollars for a lab grade scale using magnetic force reduction so it has zero drift and has true accuracy to .02 grains not just .02 gr resolution. I will stick to my beam but for those who want a really good electronic this is the best deal on the net at the moment combined with a autothrow and autotrickler https://www.autotrickler.com/auto-trickler.html and you have the poor mans version of the Prometheus http://www.prometheustoolcorp.com/ I read on another forum that A&D is not honoring the rebate for scale at the $500 price. Another person received a response from A&D that said that weren't issuing a rebate based on the $500 price paid since it was less than 30% off their list price. If that is the case, no one is getting a rebate since the selling price of the scale is less than a price that is 30% off their list price. Their rebate form doesn't inform a buyer of that information either. I just sent my rebate form in today so we'll see. Last edited by ed308; March 22, 2018 at 01:30 PM. |
March 22, 2018, 12:42 PM | #31 |
Senior Member
Join Date: March 1, 2009
Posts: 4,232
|
considering Cambridge has this on its website I would not sweat anonymous postings on the net
**Thinking about an FX-120I? For a limited time only, bring home an FX-120I for 30% off the purchase price with a new manufacturer’s rebate from A&D Weighing. How does it work? Order an FX-120I, fill out the included rebate form with a copy of your invoice and remit to A&D using the instructions on the rebate form. https://ce-products.myshopify.com/pr...nt=41172916742
__________________
“How do I get to the next level?” Well, you get to the next level by being the first one on the range and the last one to leave.” – Jerry Miculek |
March 22, 2018, 01:34 PM | #32 |
Senior Member
Join Date: November 5, 2016
Location: DFW, TX
Posts: 1,147
|
The person who got the message from A&D has already contacted CE and they are looking into it. Based on the fine print on the rebate form, A&D doesn't have leg to stand on IMO.
Update: Per a thread on the .5 Creedmoor forum, A&D has reconsidered and will be honoring the rebates for the purchased price. Last edited by ed308; March 22, 2018 at 01:55 PM. |
March 22, 2018, 09:11 PM | #33 |
Senior Member
Join Date: March 1, 2009
Posts: 4,232
|
looks like A&D realized what a gigantic screwup they were making and are honoring it now. PR and legal fees would have ran them more than the rebates.
I have been following the drama on another forum where at least ten people had ordered one
__________________
“How do I get to the next level?” Well, you get to the next level by being the first one on the range and the last one to leave.” – Jerry Miculek |
March 22, 2018, 11:00 PM | #34 |
Senior Member
Join Date: November 5, 2016
Location: DFW, TX
Posts: 1,147
|
Agreed. BTW, thanks for the link. Got the scale and Autotrickler heading my way.
|
March 23, 2018, 12:00 PM | #35 |
Senior Member
Join Date: November 5, 2016
Location: DFW, TX
Posts: 1,147
|
Just got my tracking number from CE. The auto Trickler is backordered and they sending a FX200i instead of a FX-120i scale. Appears to be the same scale but higher capacity (220 compared to 120) and slightly more expensive. Would you have a concern with the change? Not sure I'll ever need a scale with that capacity.
|
March 23, 2018, 12:28 PM | #36 |
Senior Member
Join Date: September 20, 2017
Posts: 197
|
The Auto-throw completes the package. Can load 50 rounds in no time compared to throwing low with Lyman Gen 5 powder dispenser and hand trickling to exact weight. Convert everything over to grams and get a smidgen more accuracy. I use staples to set target weight. Have to cut to get to exact weight.
|
March 23, 2018, 01:11 PM | #37 | |
Senior Member
Join Date: April 10, 2008
Location: Alaska
Posts: 7,014
|
Quote:
__________________
Science and Facts are True whether you believe it or not |
|
March 23, 2018, 02:48 PM | #38 | |
Senior Member
Join Date: March 1, 2009
Posts: 4,232
|
if another one of those deals comes around later this year I will probably jump on it. But until then I managed to snag a deal on a Lyman M5 which will get the tuning and a video camera treatment.
Quote:
__________________
“How do I get to the next level?” Well, you get to the next level by being the first one on the range and the last one to leave.” – Jerry Miculek Last edited by hounddawg; March 23, 2018 at 03:00 PM. |
|
March 23, 2018, 03:48 PM | #39 |
Senior Member
Join Date: March 20, 2018
Posts: 122
|
Why not use a scale reading in grams and just make the conversion from grains? I just saw a Tinsay scale that reads 200 g to +/- 0.001 g for $120 on Amazon. That is better than 0.1 grain precision. What's wrong with that?
|
March 23, 2018, 04:30 PM | #40 | |
Senior Member
Join Date: March 1, 2009
Posts: 4,232
|
Quote:
__________________
“How do I get to the next level?” Well, you get to the next level by being the first one on the range and the last one to leave.” – Jerry Miculek |
|
March 24, 2018, 11:51 AM | #41 |
Senior Member
Join Date: November 5, 2016
Location: DFW, TX
Posts: 1,147
|
Drift will likely also be a problem, as it is with all strain gauge scales.
|
March 24, 2018, 02:58 PM | #42 |
Senior Member
Join Date: September 11, 2005
Posts: 1,023
|
Mines called a balance beam, don't trust electronic gizmos.
__________________
Courage is what it takes to stand up and speak out, Courage is also what it takes to sit down and listen, Winston Churchill. |
March 24, 2018, 04:36 PM | #43 | |
Senior Member
Join Date: March 20, 2018
Posts: 122
|
Quote:
Are you saying that recipes specifying powder to 0.001 grain is a real thing or not? I was talking about 0.001 g which is between 0.01 and 0.02 gr. Isn't that the limit at which you commonly work? |
|
March 24, 2018, 05:37 PM | #44 |
Senior Member
Join Date: September 2, 2010
Location: Plainview , Long Island NY
Posts: 3,863
|
I use the RCBS ChargeMaster 1500 and double check with the GemPro 250 very accurate little scale.
|
March 24, 2018, 06:12 PM | #45 |
Senior Member
Join Date: March 2, 2017
Posts: 1,868
|
Blow's my mind how much some of you are willing to spend on a scale! Up to $600! Will the thing do anything other than weight things? You know kind of like cell phones today!
|
March 24, 2018, 06:14 PM | #46 |
Senior Member
Join Date: March 2, 2017
Posts: 1,868
|
Blow's my mind how much some of you are willing to spend on a scale! Up to $600! Will the thing do anything other than weight things? You know kind of like cell phones today! I think it was another site, some guy wanted to tell everyone about the budget long range rifle he got built. Budget is the key word here, $3000! That's budget?
|
March 24, 2018, 06:20 PM | #47 |
Senior Member
Join Date: March 5, 2016
Posts: 374
|
I can second or third the GemPro 250.
|
March 24, 2018, 09:06 PM | #48 |
Senior Member
Join Date: September 20, 2017
Posts: 197
|
I had a Gempro. Mine was slow reacting and would not read a single kernal drop. It drifted continually while weighing. It is not bad for the price but you do get what you pay for. Those with tendencies toward OCD find it unacceptable. Scales have software that try to control drift. The Gempro software will not see very slow tricking. It treats very slow increases in weight as drift. The FX-120i scale has software also. But you can disable the drift correction. Something not possible on the Gempro. How does it react with the drift software disabled? It will read every kernal of powder as it is dropped, but about every 5 weighings it will drift about .02 grains. That will throw it out of auto until you rezero. So I mostly leave the software running. But it is a much better scale than the Gempro. And it runs the Autotrickler and autothrow.
|
March 24, 2018, 09:12 PM | #49 | |||
Senior Member
Join Date: March 1, 2009
Posts: 4,232
|
Quote:
Code:
Name:44.6 Number of Shots 5 Extreme Spread 29 Average 2752 Standard Deviation 9 Shot 1 2737 2 2754 3 2754 4 2766 5 2749 Name: 44.5 Number of Shots 5 Extreme Spread 11 Average 2748 Standard Deviation 3 Shot 1 2749 2 2749 3 2754 4 2749 5 2743 Name:44.4 Number of Shots 5 Extreme Spread 17 Average 2743 Standard Deviation 6 Shot 1 2743 2 2749 3 2743 4 2749 5 2732 Name:44.4 to 44.6 Combined Shot 1 2737 2 2754 3 2754 4 2766 5 2749 6 2749 7 2749 8 2754 9 2749 10 2743 11 2743 12 2749 13 2743 14 2749 15 2732 Number of Shots 15 Extreme Spread 45 Average 2,748 Standard Deviation 8 Quote:
Quote:
__________________
“How do I get to the next level?” Well, you get to the next level by being the first one on the range and the last one to leave.” – Jerry Miculek Last edited by hounddawg; March 25, 2018 at 08:56 AM. |
|||
March 25, 2018, 12:55 AM | #50 |
Senior Member
Join Date: January 6, 2008
Location: Northeast Colorado
Posts: 1,993
|
"Powder charges, as long as they were fairly consistent and bracketed within a couple of grains, were not important. He threw all of his charges with a Belding & Mull powder measure, and for one experiment he shot groups using three different powder measure settings (51, 52 & 53) … all three groups were identical."
From the Houston Warehouse Experiment http://precisionrifleblog.com/2013/1...ifle-accuracy/ Is creating charges within plus or minus a few kernals of powder that critical? I readily admit to being a Fudd that feels impressed with himself with 1 inch groups at 300 yards, and thinks smacking prairie rats at 400 is truley satisfying. Just curious. |
Tags |
scale |
Thread Tools | Search this Thread |
|
|